Pub Date : 1987-10-01DOI: 10.1080/03015521.1987.10425593
E. Thom, R. Gillespie
Abstract The cool season forage production of Florida oats (FO) was measured in a series of replicated small plot trials at the Ruakura Agriculture Centre over five successive seasons. The oats were grown as part of a double cropping system using maize as the complementary warm season crop. Combined annual forage maize/oats yields averaged 26 t dry matter (DM)/ha. Experiments in 1978 and 1979 showed that forage production of the earlier maturing FO was higher than that of New Zealand-bred oat and wheat cultivars (11–13 t DM/ha v. 9–11 t DM/ha) when sown in April and cut in early October (‘ensiling’ yield). Subsequent experiments from 1980 to 1982 measured the yield response of FO to three rates of nitrogen (N) fertiliser (O, 35 and 70 kg N/ha) applied during tillering, following direct drilling into maize stubble. ‘Ensiling’ yields were high (9–13 t DM/ha) but yield responses to N fertiliser were small except in 1981 when June and July were warmer than average. FO was capable of consistently high yields w...
在连续5个季节的Ruakura农业中心，通过一系列重复的小块试验，测量了佛罗里达燕麦(FO)的冷季饲料产量。燕麦作为双季制的一部分种植，玉米作为暖季作物的补充。年饲用玉米/燕麦复合产量平均为26 t干物质/公顷。1978年和1979年的试验表明，早熟FO在4月播种、10月初收割时的饲料产量(青贮产量)高于新西兰品种的燕麦和小麦(11-13 t DM/ha vs . 9-11 t DM/ha)。1980年至1982年的后续试验测量了分蘖期间直接钻入玉米茬后，三种氮肥(0、35和70公斤N/公顷)对FO产量的响应。青贮产量高(9-13吨干小麦/公顷)，但除1981年6月和7月比平均温度高外，对氮肥的产量响应较小。FO能够持续高产…
{"title":"The contribution of forage oats to annual feed production when grown after maize in a double cropping system","authors":"E. Thom, R. Gillespie","doi":"10.1080/03015521.1987.10425593","DOIUrl":"https://doi.org/10.1080/03015521.1987.10425593","url":null,"abstract":"Abstract The cool season forage production of Florida oats (FO) was measured in a series of replicated small plot trials at the Ruakura Agriculture Centre over five successive seasons. The oats were grown as part of a double cropping system using maize as the complementary warm season crop. Combined annual forage maize/oats yields averaged 26 t dry matter (DM)/ha. Experiments in 1978 and 1979 showed that forage production of the earlier maturing FO was higher than that of New Zealand-bred oat and wheat cultivars (11–13 t DM/ha v. 9–11 t DM/ha) when sown in April and cut in early October (‘ensiling’ yield). Subsequent experiments from 1980 to 1982 measured the yield response of FO to three rates of nitrogen (N) fertiliser (O, 35 and 70 kg N/ha) applied during tillering, following direct drilling into maize stubble. ‘Ensiling’ yields were high (9–13 t DM/ha) but yield responses to N fertiliser were small except in 1981 when June and July were warmer than average. FO was capable of consistently high yields w...","PeriodicalId":19285,"journal":{"name":"New Zealand journal of experimental agriculture","volume":"3 1","pages":"419-423"},"PeriodicalIF":0.0,"publicationDate":"1987-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91238630","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1987-07-01DOI: 10.1080/03015521.1987.10425583
M. R. Butcher, D. Penman, R. R. Scott
Abstract Strawberry (cv. ‘Red Gauntlet’) yield was measured over two growing seasons, 1984 — 85 and 1985 — 86, in field experiments with a series of treatments involving two-spotted spider mite (TSSM) (Tetranychus urticae Koch), exclusion of predators and pesticide application. Two-spotted spider mite populations were much higher on first season plants than on older plants. Insecticides and miticides apparently play an important role in TSSM population regulation in first season plants but natural population regulation may be more important in populations on older plants. In their first season, plants yielded significantly less than second season plants, although mean berry weight was similar. The yield variation in plants of different ages cannot solely be attributable to seasonal affects. High, uncontrolled TSSM infestations in one season reduced yield in the following season but in the second season the yield variation between newly planted and established plants was still evident. Mite levels on estab...
{"title":"The relationship between two-spotted spider mite and strawberry yield in Canterbury","authors":"M. R. Butcher, D. Penman, R. R. Scott","doi":"10.1080/03015521.1987.10425583","DOIUrl":"https://doi.org/10.1080/03015521.1987.10425583","url":null,"abstract":"Abstract Strawberry (cv. ‘Red Gauntlet’) yield was measured over two growing seasons, 1984 — 85 and 1985 — 86, in field experiments with a series of treatments involving two-spotted spider mite (TSSM) (Tetranychus urticae Koch), exclusion of predators and pesticide application. Two-spotted spider mite populations were much higher on first season plants than on older plants. Insecticides and miticides apparently play an important role in TSSM population regulation in first season plants but natural population regulation may be more important in populations on older plants. In their first season, plants yielded significantly less than second season plants, although mean berry weight was similar. The yield variation in plants of different ages cannot solely be attributable to seasonal affects. High, uncontrolled TSSM infestations in one season reduced yield in the following season but in the second season the yield variation between newly planted and established plants was still evident. Mite levels on estab...","PeriodicalId":19285,"journal":{"name":"New Zealand journal of experimental agriculture","volume":"56 1","pages":"367-370"},"PeriodicalIF":0.0,"publicationDate":"1987-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74871750","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1987-07-01DOI: 10.1080/03015521.1987.10425573
A. Roberts
Abstract Two sites in Taranaki on well developed, grazed pasture with generous fertiliser histories were selected for monitoring changes over time in Ministry of Agriculture and Fisheries soil Quick Test values and nutrient levels in mixed pasture. Soil samples were taken at 14-day intervals, and plant samples every 28 days, over a 3-year period. Large temporal variations in soil Quick Test values occurred but few seasonal trends were evident. Obvious seasonal trends occurred with plant N, S, P, and Ca, with less well denned seasonal variations in K and Mg contents. There was no correlation between soil test values and plant mineral composition for Ca, K, P, and Mg except at Stratford in the summer period. Plant mineral composition in relation to animal requirements is briefly discussed.
{"title":"Seasonal variation in soil tests and nutrient content of pasture at two sites in Taranaki","authors":"A. Roberts","doi":"10.1080/03015521.1987.10425573","DOIUrl":"https://doi.org/10.1080/03015521.1987.10425573","url":null,"abstract":"Abstract Two sites in Taranaki on well developed, grazed pasture with generous fertiliser histories were selected for monitoring changes over time in Ministry of Agriculture and Fisheries soil Quick Test values and nutrient levels in mixed pasture. Soil samples were taken at 14-day intervals, and plant samples every 28 days, over a 3-year period. Large temporal variations in soil Quick Test values occurred but few seasonal trends were evident. Obvious seasonal trends occurred with plant N, S, P, and Ca, with less well denned seasonal variations in K and Mg contents. There was no correlation between soil test values and plant mineral composition for Ca, K, P, and Mg except at Stratford in the summer period. Plant mineral composition in relation to animal requirements is briefly discussed.","PeriodicalId":19285,"journal":{"name":"New Zealand journal of experimental agriculture","volume":"100 1","pages":"283-294"},"PeriodicalIF":0.0,"publicationDate":"1987-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77370706","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1987-07-01DOI: 10.1080/03015521.1987.10425576
A. Passman, R. Sumner
Abstract Groups of 20 Romney, Coopworth, and Perendale wether lambs were slaughtered at either 10, 20, or 30 weeks of age. The 10-week groups were slaughtered woolly; the remainder were shorn at 10 weeks of age. After slaughter, the skins were evaluated for suitability for wool-on tannage, treated with depilatory, and processed into crust leather. All unshorn skins were unsuited for wool-on tannage. Perendale shorn skins were more suited to clothing use and Romney and Coopworth shorn skins to rug use. Coopworth skins, pelts, and leathers were larger and heavier than those of the Romney and Perendale. There were significant breed x age interactions for changes in pelt area during processing. Skins, pelts, and leathers increased in size, thickness, and weight with increasing age. Perendale and Romney leathers had more extensible grain layers. Coopworth leathers were less resistant to tearing after adjustment for thickness differences. There were no interactions between breed and age for any subjectively ass...
{"title":"Effects of breed and age at slaughter on leather produced from export lambs reared on hill country","authors":"A. Passman, R. Sumner","doi":"10.1080/03015521.1987.10425576","DOIUrl":"https://doi.org/10.1080/03015521.1987.10425576","url":null,"abstract":"Abstract Groups of 20 Romney, Coopworth, and Perendale wether lambs were slaughtered at either 10, 20, or 30 weeks of age. The 10-week groups were slaughtered woolly; the remainder were shorn at 10 weeks of age. After slaughter, the skins were evaluated for suitability for wool-on tannage, treated with depilatory, and processed into crust leather. All unshorn skins were unsuited for wool-on tannage. Perendale shorn skins were more suited to clothing use and Romney and Coopworth shorn skins to rug use. Coopworth skins, pelts, and leathers were larger and heavier than those of the Romney and Perendale. There were significant breed x age interactions for changes in pelt area during processing. Skins, pelts, and leathers increased in size, thickness, and weight with increasing age. Perendale and Romney leathers had more extensible grain layers. Coopworth leathers were less resistant to tearing after adjustment for thickness differences. There were no interactions between breed and age for any subjectively ass...","PeriodicalId":19285,"journal":{"name":"New Zealand journal of experimental agriculture","volume":"19 1","pages":"309-316"},"PeriodicalIF":0.0,"publicationDate":"1987-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91145480","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1987-07-01DOI: 10.1080/03015521.1987.10425577
G. K. Burge, C. Spence, R. Marshall
Abstract On well pollinated kiwifruit vines (Actinidia deliciosa (A. Chev.) C. F. Liang et A. R. Ferguson var. deliciosa cv. Hayward) a reduction in fruit numbers by flower thinning increased mean fruit weight. Thinning reduced total yield and yield of fruit in the preferred export sizes (i.e., fruit weight >90 g). Reducing fruit numbers to less than 330 per metre of T-bar row increased yield of fruit in the two large size grades only (> 132 g). Flower production was less on vines that had a high crop load the previous season. This reduction was primarily because of fewer flowers per flowering shoot. Percentage bud break and the proportion of non-flowering shoots were not affected. Up to threefold differences in fruit numbers per vine were produced by the thinning treatments but this did not significantly affect vegetative growth or the soluble solids content of fruit near harvest.
{"title":"Kiwifruit: Effects of thinning on fruit size, vegetative growth, and return bloom","authors":"G. K. Burge, C. Spence, R. Marshall","doi":"10.1080/03015521.1987.10425577","DOIUrl":"https://doi.org/10.1080/03015521.1987.10425577","url":null,"abstract":"Abstract On well pollinated kiwifruit vines (Actinidia deliciosa (A. Chev.) C. F. Liang et A. R. Ferguson var. deliciosa cv. Hayward) a reduction in fruit numbers by flower thinning increased mean fruit weight. Thinning reduced total yield and yield of fruit in the preferred export sizes (i.e., fruit weight >90 g). Reducing fruit numbers to less than 330 per metre of T-bar row increased yield of fruit in the two large size grades only (> 132 g). Flower production was less on vines that had a high crop load the previous season. This reduction was primarily because of fewer flowers per flowering shoot. Percentage bud break and the proportion of non-flowering shoots were not affected. Up to threefold differences in fruit numbers per vine were produced by the thinning treatments but this did not significantly affect vegetative growth or the soluble solids content of fruit near harvest.","PeriodicalId":19285,"journal":{"name":"New Zealand journal of experimental agriculture","volume":"25 1","pages":"317-324"},"PeriodicalIF":0.0,"publicationDate":"1987-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79167395","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1987-07-01DOI: 10.1080/03015521.1987.10425575
D. Orwin, R. Gourdie, J. Woods, K. Geenty
Abstract Two methods of measuring New Zealand Romney and Corriedale wools for staple strength were compared. There was a good correlation (r = 0.92) between staple strength measurements of the same midside wools using either a simple manual tester or a commercial tensile tester. Staple strengths standardised by either the clean mass of wool broken or the more rapidly determined greasy linear density at the position of break were also highly correlated. The more rapid method could be used instead of conventional methods without major changes in the rankings of the wools, although the absolute staple strength values obtained may differ according to the method of standardisation used. A moderately close relationship was found between staple strength and barbe (fibre length after carding).
{"title":"Measuring staple strength of New Zealand Romney and Corriedale wools","authors":"D. Orwin, R. Gourdie, J. Woods, K. Geenty","doi":"10.1080/03015521.1987.10425575","DOIUrl":"https://doi.org/10.1080/03015521.1987.10425575","url":null,"abstract":"Abstract Two methods of measuring New Zealand Romney and Corriedale wools for staple strength were compared. There was a good correlation (r = 0.92) between staple strength measurements of the same midside wools using either a simple manual tester or a commercial tensile tester. Staple strengths standardised by either the clean mass of wool broken or the more rapidly determined greasy linear density at the position of break were also highly correlated. The more rapid method could be used instead of conventional methods without major changes in the rankings of the wools, although the absolute staple strength values obtained may differ according to the method of standardisation used. A moderately close relationship was found between staple strength and barbe (fibre length after carding).","PeriodicalId":19285,"journal":{"name":"New Zealand journal of experimental agriculture","volume":"14 3 1","pages":"303-308"},"PeriodicalIF":0.0,"publicationDate":"1987-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78496642","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1987-07-01DOI: 10.1080/03015521.1987.10425572
J. Morton, P. Williams
Abstract Trials on an Addison gley podzol and a Hokitika recent soil determined the production responses to applied superphosphate of pasture under sheep grazing over a 5-year period. Rates of 20 and 22 kg effective (i.e., citric acid soluble) P/ha resulted in 86 and 98% of maximum pasture production for the Addison and Hokitika soils, respectively. These rates were similar to predicted maintenance rates of 19 and 25 kg effective P/ha from the Computerised Fertiliser Advisory Scheme of the New Zealand Ministry of Agriculture and Fisheries. Pasture production was maintained at Olsen P levels of 8 μg/ml for the Addison soil and 22 μg/ml for the Hokitika soil, differing from the predicted Olsen P level of 17 μg/ml. When compared with earlier mowing-only trials with clippings returned, the use of short grazing durations at high sheep stocking densities and 4–6 week regrowth intervals resulted in similar pasture yield responses to added phosphorus.
{"title":"Phosphorus requirements of grazed pasture on pakihi and recent soils of the South Island west coast","authors":"J. Morton, P. Williams","doi":"10.1080/03015521.1987.10425572","DOIUrl":"https://doi.org/10.1080/03015521.1987.10425572","url":null,"abstract":"Abstract Trials on an Addison gley podzol and a Hokitika recent soil determined the production responses to applied superphosphate of pasture under sheep grazing over a 5-year period. Rates of 20 and 22 kg effective (i.e., citric acid soluble) P/ha resulted in 86 and 98% of maximum pasture production for the Addison and Hokitika soils, respectively. These rates were similar to predicted maintenance rates of 19 and 25 kg effective P/ha from the Computerised Fertiliser Advisory Scheme of the New Zealand Ministry of Agriculture and Fisheries. Pasture production was maintained at Olsen P levels of 8 μg/ml for the Addison soil and 22 μg/ml for the Hokitika soil, differing from the predicted Olsen P level of 17 μg/ml. When compared with earlier mowing-only trials with clippings returned, the use of short grazing durations at high sheep stocking densities and 4–6 week regrowth intervals resulted in similar pasture yield responses to added phosphorus.","PeriodicalId":19285,"journal":{"name":"New Zealand journal of experimental agriculture","volume":"4 1","pages":"277-282"},"PeriodicalIF":0.0,"publicationDate":"1987-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85332514","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1987-07-01DOI: 10.1080/03015521.1987.10425581
J. Toye, P. Glucina, T. Minamide
Abstract Exposing ‘Hiratanenashi’ persimmons to 90–100% CO2 for 24 h at 30°C was effective in removing astringency. Rate of astringency loss was slowed considerably when treated fruit were subsequently stored at 0°C (3 weeks to lose astringency at 0°C; 4–5 days at 20°C). Fruit treated with CO2 and stored 4 weeks at 7°C developed chilling injury. Delaying treatment with CO2 until after 3 weeks storage at 0°C impaired complete astringency removal. ‘Hiratanenashi’ fruit treated with CO2 had a storage life of 4 weeks at 0°C, with 5 days subsequent shelf-life at 20°C. Fruit from the mid harvest period stored best. The implication of these results on the feasibility of commercially treating astringent persimmons in New Zealand before shipping the fruit, at 0°C, to some overseas markets is discussed.
{"title":"Removal of astringency and storage of ‘Hiratanenashi’ persimmon fruits","authors":"J. Toye, P. Glucina, T. Minamide","doi":"10.1080/03015521.1987.10425581","DOIUrl":"https://doi.org/10.1080/03015521.1987.10425581","url":null,"abstract":"Abstract Exposing ‘Hiratanenashi’ persimmons to 90–100% CO2 for 24 h at 30°C was effective in removing astringency. Rate of astringency loss was slowed considerably when treated fruit were subsequently stored at 0°C (3 weeks to lose astringency at 0°C; 4–5 days at 20°C). Fruit treated with CO2 and stored 4 weeks at 7°C developed chilling injury. Delaying treatment with CO2 until after 3 weeks storage at 0°C impaired complete astringency removal. ‘Hiratanenashi’ fruit treated with CO2 had a storage life of 4 weeks at 0°C, with 5 days subsequent shelf-life at 20°C. Fruit from the mid harvest period stored best. The implication of these results on the feasibility of commercially treating astringent persimmons in New Zealand before shipping the fruit, at 0°C, to some overseas markets is discussed.","PeriodicalId":19285,"journal":{"name":"New Zealand journal of experimental agriculture","volume":"42 1","pages":"351-355"},"PeriodicalIF":0.0,"publicationDate":"1987-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91277836","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1987-07-01DOI: 10.1080/03015521.1987.10425579
E. Macrae
Abstract Fruit of ‘Fuyu’ persimmon (Diospyros kaki L.) were harvested from commercial orchards and stored in 1984–1986. Fruit maturation varied considerably between the three seasons, in particular in the relationship between soluble solids concentration, loss of astringency, and colour development. Development of chilling injury (CI) in fruit during storage varied with season, harvest time, and storage treatment. Fruit harvested in 1984 stored longer without CI at 0°C than fruit harvested in 1985 or 1986. In 1986 fruit harvested late in the season had less CI than those harvested early. Both preconditioning of fruit and storage in a modified atmosphere (MA) formed by polyethylene bags (polybags) ameliorated chilling damage. Respiration rates of fruit held at 20 °C after 0°C storage closely correlated with chilling damage; injured fruit showed higher respiration rates. Fruit stored in MA showed a relationship between oxygen level during cool storage and development of CI; high O2 levels (14–20%) allowed g...
{"title":"Development of chilling injury in New Zealand grown ‘Fuyu’ persimmon during storage","authors":"E. Macrae","doi":"10.1080/03015521.1987.10425579","DOIUrl":"https://doi.org/10.1080/03015521.1987.10425579","url":null,"abstract":"Abstract Fruit of ‘Fuyu’ persimmon (Diospyros kaki L.) were harvested from commercial orchards and stored in 1984–1986. Fruit maturation varied considerably between the three seasons, in particular in the relationship between soluble solids concentration, loss of astringency, and colour development. Development of chilling injury (CI) in fruit during storage varied with season, harvest time, and storage treatment. Fruit harvested in 1984 stored longer without CI at 0°C than fruit harvested in 1985 or 1986. In 1986 fruit harvested late in the season had less CI than those harvested early. Both preconditioning of fruit and storage in a modified atmosphere (MA) formed by polyethylene bags (polybags) ameliorated chilling damage. Respiration rates of fruit held at 20 °C after 0°C storage closely correlated with chilling damage; injured fruit showed higher respiration rates. Fruit stored in MA showed a relationship between oxygen level during cool storage and development of CI; high O2 levels (14–20%) allowed g...","PeriodicalId":19285,"journal":{"name":"New Zealand journal of experimental agriculture","volume":"13 1","pages":"333-344"},"PeriodicalIF":0.0,"publicationDate":"1987-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78504155","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1987-07-01DOI: 10.1080/03015521.1987.10425580
P. Prendergast, K. Mcaneney, M. Astill, A. D. Wilson, R. Barber
Abstract The behaviour of 4-year-old kiwifruit (Actinidia deliciosa (A. Chev.) C. F. Liang & A. R. Ferguson) vines growing in a Springbank soil within the Kerikeri Irrigation Scheme was monitored over the 1982–83 season. Water stress was induced in two vines by withholding irrigation and preventing rainfall recharge. Fruit volume expansion appeared strongly linked to the hydraulic status of the vines and could be described by a simple model whereby fruit either expand at the maximum rate shown on well-watered vines, or not at all if water is limiting. Volume losses resulting from fruit softening after extreme water stress were quickly recovered upon the reapplication of irrigation and could be ignored for modelling the influence of water stress on harvest yields. In the absence of rainfall or irrigation, the readily available moisture in this soil is capable of maintaining unrestricted fruit volume expansion for 10 days in mid summer. This result is extrapolated to other soils within the Irrigation Scheme...
4年生猕猴桃(Actinidia deliciosa (A. Chev.))的行为C. F. Liang和a . R. Ferguson)在Kerikeri灌溉计划下的春滩土壤中生长的葡萄藤在1982-83年期间进行了监测。对两株葡萄藤进行了不灌水和不补雨的处理。果实体积膨胀似乎与葡萄藤的水力状态密切相关，可以用一个简单的模型来描述，即果实要么在水分充足的葡萄藤上以最大速度膨胀，要么在水分有限的情况下根本不膨胀。极端水分胁迫后果实软化造成的体积损失在重新灌溉后迅速恢复，在模拟水分胁迫对收获产量的影响时可以忽略。在没有降雨或灌溉的情况下，这种土壤中现成的水分能够在仲夏保持10天不受限制的果实体积膨胀。这一结果可外推到灌溉计划内的其他土壤。
{"title":"Water extraction and fruit expansion by kiwifruit","authors":"P. Prendergast, K. Mcaneney, M. Astill, A. D. Wilson, R. Barber","doi":"10.1080/03015521.1987.10425580","DOIUrl":"https://doi.org/10.1080/03015521.1987.10425580","url":null,"abstract":"Abstract The behaviour of 4-year-old kiwifruit (Actinidia deliciosa (A. Chev.) C. F. Liang & A. R. Ferguson) vines growing in a Springbank soil within the Kerikeri Irrigation Scheme was monitored over the 1982–83 season. Water stress was induced in two vines by withholding irrigation and preventing rainfall recharge. Fruit volume expansion appeared strongly linked to the hydraulic status of the vines and could be described by a simple model whereby fruit either expand at the maximum rate shown on well-watered vines, or not at all if water is limiting. Volume losses resulting from fruit softening after extreme water stress were quickly recovered upon the reapplication of irrigation and could be ignored for modelling the influence of water stress on harvest yields. In the absence of rainfall or irrigation, the readily available moisture in this soil is capable of maintaining unrestricted fruit volume expansion for 10 days in mid summer. This result is extrapolated to other soils within the Irrigation Scheme...","PeriodicalId":19285,"journal":{"name":"New Zealand journal of experimental agriculture","volume":"8 1","pages":"345-350"},"PeriodicalIF":0.0,"publicationDate":"1987-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74434968","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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