Pub Date : 1987-07-01DOI: 10.1080/03015521.1987.10425574
H. Hawker, K. Thompson
Abstract In each of two years, pasture allowances of 0.7, 1.2, 1.7, or 2.2 kg dry matter (DM)/ewe per day were offered to groups of Romney ewes for 6 weeks in June — July. The ewes were then run together until weaning in December. In Year 1 there were 70 2-year-old ewes per group; mean initial liveweight was 47 (SE 0.25) kg. In Year 2 each group comprised 25 2-year-old ewes with a mean initial liveweight of 48 (SE 0.49) kg and 25 6-year-old ewes with a mean initial liveweight of 57 kg. For liveweight change (g/day), the inverse linear relationship with pasture allowance (kg DM/ewe per day) for ewes with one lamb in utero was: [liveweight change = 136 (SE 4.4) — (132 (SE 5.0) allowance)]. On average, the pasture allowance that resulted in zero liveweight change was predicted to be 1.0 kg DM/ewe per day. With a pregrazing pasture mass of c. 2000 kg DM/ha, zero liveweight change was associated with a residual pasture mass of 760 kg DM/ha, a utilisation of 66%, and an apparent intake of 0.59 kg DM/ewe per day...
摘要/ Abstract摘要:在6 - 7月，每隔2年，罗姆尼母羊各组每天分别给予0.7、1.2、1.7和2.2 kg干物质(DM)/母羊的牧场补贴，为期6周。然后这些母羊一起跑，直到12月断奶。第1年每组70只2岁母羊;平均初始活重为47 (SE 0.25) kg。第2年，每组25只2岁母羊，平均初始活重为48 (SE 0.49) kg, 25只6岁母羊，平均初始活重为57 kg。对于1只母羊的活重变化(g/d)，与放养量(kg DM/母羊/d)呈反比线性关系:[活重变化= 136 (SE 4.4) - (132 (SE 5.0))]。平均而言，导致活重零变化的牧场补给量预计为1.0 kg DM/母羊/天。在放牧前牧草质量约为2000 kg DM/ha的情况下，零活重变化与剩余牧草质量760 kg DM/ha、利用率66%和0.59 kg DM/母羊的表观采食量相关。
{"title":"Effects of pasture allowance in winter on liveweight, wool growth, and wool characteristics of Romney ewes","authors":"H. Hawker, K. Thompson","doi":"10.1080/03015521.1987.10425574","DOIUrl":"https://doi.org/10.1080/03015521.1987.10425574","url":null,"abstract":"Abstract In each of two years, pasture allowances of 0.7, 1.2, 1.7, or 2.2 kg dry matter (DM)/ewe per day were offered to groups of Romney ewes for 6 weeks in June — July. The ewes were then run together until weaning in December. In Year 1 there were 70 2-year-old ewes per group; mean initial liveweight was 47 (SE 0.25) kg. In Year 2 each group comprised 25 2-year-old ewes with a mean initial liveweight of 48 (SE 0.49) kg and 25 6-year-old ewes with a mean initial liveweight of 57 kg. For liveweight change (g/day), the inverse linear relationship with pasture allowance (kg DM/ewe per day) for ewes with one lamb in utero was: [liveweight change = 136 (SE 4.4) — (132 (SE 5.0) allowance)]. On average, the pasture allowance that resulted in zero liveweight change was predicted to be 1.0 kg DM/ewe per day. With a pregrazing pasture mass of c. 2000 kg DM/ha, zero liveweight change was associated with a residual pasture mass of 760 kg DM/ha, a utilisation of 66%, and an apparent intake of 0.59 kg DM/ewe per day...","PeriodicalId":19285,"journal":{"name":"New Zealand journal of experimental agriculture","volume":"10 1","pages":"295-302"},"PeriodicalIF":0.0,"publicationDate":"1987-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91285025","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: 10.1080/03015521.1987.10425578
C. Kingston
Abstract Boysenberry (Rubus hybrid) plants were sprayed to run-off with 4-chlorophenoxyacetic acid (4-CPA) at 100 mg litre-1, in the 1983–84 season, when 80% of flowers had reached anthesis. Harvested yield was not affected by 4-CPA treatment. Berry size was significantly increased because of greater numbers of drupelets in the berries. Drupelet numbers were always increased by 4-CPA, irrespective of the level of insect pollination. Fruit from plants sprayed with 4-CPA ripened one week later than fruit from unsprayed plants, but length of harvest period remained unaltered.
摘要在1983 ~ 84年花开花80%的季节，以100 mg l / 1的4-氯苯氧乙酸(4-CPA)喷施于径流中。4-CPA处理对收获产量无影响。果实的大小显著增加，因为果实中有更多的小核果。无论昆虫授粉水平如何，4-CPA均能增加小核果数。4-CPA喷施植株的果实成熟时间比未喷施植株晚一周，但收获期长度不变。
{"title":"Boysenberry: Effect of 4-chlorophenoxyacetic acid on yield components and maturity","authors":"C. Kingston","doi":"10.1080/03015521.1987.10425578","DOIUrl":"https://doi.org/10.1080/03015521.1987.10425578","url":null,"abstract":"Abstract Boysenberry (Rubus hybrid) plants were sprayed to run-off with 4-chlorophenoxyacetic acid (4-CPA) at 100 mg litre-1, in the 1983–84 season, when 80% of flowers had reached anthesis. Harvested yield was not affected by 4-CPA treatment. Berry size was significantly increased because of greater numbers of drupelets in the berries. Drupelet numbers were always increased by 4-CPA, irrespective of the level of insect pollination. Fruit from plants sprayed with 4-CPA ripened one week later than fruit from unsprayed plants, but length of harvest period remained unaltered.","PeriodicalId":19285,"journal":{"name":"New Zealand journal of experimental agriculture","volume":"15 1","pages":"325-331"},"PeriodicalIF":0.0,"publicationDate":"1987-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74232742","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: 10.1080/03015521.1987.10425585
K. Stewart, R. Archibald
Abstract In a field trial carried out at three sites over 2 years at Owaka, South Otago, mob stocking of pasture by sheep in February caused up to 75% mortality of porina (Wiseana spp.) larvae. Mob stocking in March had less effect, suggesting that small larvae, living on or near the soil surface and forming a high proportion of the populations until late February, were most affected. There was no evidence that mob stocking affected the prevalence of virus diseases in porina populations, but microsporidial infections and parasites were higher in mob stocked compared with untreated or haymaking treatments. Haymaking did not effect porina density in the first year; it did, however, effect both porina density in the second year and virus prevalence in each year, the effects varying between sites. The reasons for this were not understood.
{"title":"The effects of pasture management on population density and diseases of porina (Lepidoptera: Hepialidae).","authors":"K. Stewart, R. Archibald","doi":"10.1080/03015521.1987.10425585","DOIUrl":"https://doi.org/10.1080/03015521.1987.10425585","url":null,"abstract":"Abstract In a field trial carried out at three sites over 2 years at Owaka, South Otago, mob stocking of pasture by sheep in February caused up to 75% mortality of porina (Wiseana spp.) larvae. Mob stocking in March had less effect, suggesting that small larvae, living on or near the soil surface and forming a high proportion of the populations until late February, were most affected. There was no evidence that mob stocking affected the prevalence of virus diseases in porina populations, but microsporidial infections and parasites were higher in mob stocked compared with untreated or haymaking treatments. Haymaking did not effect porina density in the first year; it did, however, effect both porina density in the second year and virus prevalence in each year, the effects varying between sites. The reasons for this were not understood.","PeriodicalId":19285,"journal":{"name":"New Zealand journal of experimental agriculture","volume":"19 1","pages":"375-379"},"PeriodicalIF":0.0,"publicationDate":"1987-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81941178","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: 10.1080/03015521.1987.10425582
I. Warrington, C. J. Stanley
Abstract The frost hardiness temperature (i.e., the temperature that causes damage) and the lethal temperature (i.e., the temperature that causes death) were assessed in autumn (April-May), winter (July), spring (October), and summer (January) for 10 native plant species. The species in order of increasing winter hardiness/lethal temperature were Metrosideros kermadecensis and M. carminea ( — 3/ — 5°C), Sophora tetraptera and S. microphylla (-4/-6°C), Leptospermum scoparium (-5/-8°C), Sophora prostrata (-6/-11 °C), Dicksonia fibrosa ( — 8/-11 °C), Phormium spp. ( — 6/-11 °C), Astelia chathamica ( — 8/ — 11 °C), and Pittosporum tenuifolium ‘Irene Paterson’ (-9/ — 14°C). In summer, all species had frost hardiness temperatures between-2 and-5°C and lethal temperatures between-4 and — 9°C, except the two Metrosideros species where these temperatures were-1 and-2°C, respectively. No differences among cultivars of Leptospermum scoparium (°;Martinii’;, ‘Burgundy Queen’, and ‘Nanum Huia’) or Phormium spp. (‘Maori...
{"title":"Seasonal frost tolerance of some ornamental, indigenous New Zealand plant species in the genera Astelia, Dicksonia, Leptospermum, Metrosideros, Phormium, Pittosporum, and Sophora","authors":"I. Warrington, C. J. Stanley","doi":"10.1080/03015521.1987.10425582","DOIUrl":"https://doi.org/10.1080/03015521.1987.10425582","url":null,"abstract":"Abstract The frost hardiness temperature (i.e., the temperature that causes damage) and the lethal temperature (i.e., the temperature that causes death) were assessed in autumn (April-May), winter (July), spring (October), and summer (January) for 10 native plant species. The species in order of increasing winter hardiness/lethal temperature were Metrosideros kermadecensis and M. carminea ( — 3/ — 5°C), Sophora tetraptera and S. microphylla (-4/-6°C), Leptospermum scoparium (-5/-8°C), Sophora prostrata (-6/-11 °C), Dicksonia fibrosa ( — 8/-11 °C), Phormium spp. ( — 6/-11 °C), Astelia chathamica ( — 8/ — 11 °C), and Pittosporum tenuifolium ‘Irene Paterson’ (-9/ — 14°C). In summer, all species had frost hardiness temperatures between-2 and-5°C and lethal temperatures between-4 and — 9°C, except the two Metrosideros species where these temperatures were-1 and-2°C, respectively. No differences among cultivars of Leptospermum scoparium (°;Martinii’;, ‘Burgundy Queen’, and ‘Nanum Huia’) or Phormium spp. (‘Maori...","PeriodicalId":19285,"journal":{"name":"New Zealand journal of experimental agriculture","volume":"26 1","pages":"357-365"},"PeriodicalIF":0.0,"publicationDate":"1987-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83553355","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: 10.1080/03015521.1987.10425571
W. Lowther
Abstract Three experiments were carried out to compare the effects of applying molybdenum (Mo) to inoculated, coated (pelleted) seed with applying Mo in fertiliser on Mo-deficient tussock grassland soils. White clover (Trifolium repens L.) growth was stimulated by Mo with no apparent differences in the effectiveness of pellet-or fertiliser-applied Mo. The application of Mo to pelleted seed had no detectable effects on the survival of rhizobia on the seed, early seedling establishment, or seedling nodulation. On Mo-deficient soils the application of Mo to pelleted seed is recommended, not only to ensure an even distribution of Mo but also to ensure placement of Mo in the immediate vicinity of the establishing legume seedlings.
{"title":"Application of molybdenum to inoculated, lime-coated white clover seed","authors":"W. Lowther","doi":"10.1080/03015521.1987.10425571","DOIUrl":"https://doi.org/10.1080/03015521.1987.10425571","url":null,"abstract":"Abstract Three experiments were carried out to compare the effects of applying molybdenum (Mo) to inoculated, coated (pelleted) seed with applying Mo in fertiliser on Mo-deficient tussock grassland soils. White clover (Trifolium repens L.) growth was stimulated by Mo with no apparent differences in the effectiveness of pellet-or fertiliser-applied Mo. The application of Mo to pelleted seed had no detectable effects on the survival of rhizobia on the seed, early seedling establishment, or seedling nodulation. On Mo-deficient soils the application of Mo to pelleted seed is recommended, not only to ensure an even distribution of Mo but also to ensure placement of Mo in the immediate vicinity of the establishing legume seedlings.","PeriodicalId":19285,"journal":{"name":"New Zealand journal of experimental agriculture","volume":"31 1","pages":"271-275"},"PeriodicalIF":0.0,"publicationDate":"1987-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74991608","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: 10.1080/03015521.1987.10425584
M. R. Butcher, D. Penman, R. R. Scott
Abstract The development of a binomial sequential decision plan, incorporating Taylor's power law, for control of two-spotted spider mite on strawberries in Canterbury is described and compared with a recommended spray schedule. No significant difference existed in yields between the two systems but savings of up to 4 cyhexatin applications were made by following the binomial sequential decision plan. Together with the monetary savings (NZ$500/ha, 1986 prices) from a reduction in spray applications, the problems associated with applied pesticides, resistance, and residues are minimised.
{"title":"A binomial sequential decision plan for control of two-spotted spider mite on strawberries in Canterbury.","authors":"M. R. Butcher, D. Penman, R. R. Scott","doi":"10.1080/03015521.1987.10425584","DOIUrl":"https://doi.org/10.1080/03015521.1987.10425584","url":null,"abstract":"Abstract The development of a binomial sequential decision plan, incorporating Taylor's power law, for control of two-spotted spider mite on strawberries in Canterbury is described and compared with a recommended spray schedule. No significant difference existed in yields between the two systems but savings of up to 4 cyhexatin applications were made by following the binomial sequential decision plan. Together with the monetary savings (NZ$500/ha, 1986 prices) from a reduction in spray applications, the problems associated with applied pesticides, resistance, and residues are minimised.","PeriodicalId":19285,"journal":{"name":"New Zealand journal of experimental agriculture","volume":"179 1","pages":"371-374"},"PeriodicalIF":0.0,"publicationDate":"1987-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77004735","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: 10.1080/03015521.1987.10425570
M. G. Lambert
Abstract Nitrogen (N) fixation was measured, using the acetylene reduction assay, in hill pastures at the Ballantrae Hill Country Research Station near Woodville. Measurements were made over a 12 month period starting in September 1976, on sunny and shady aspects of the six fertiliser × grazing management treatment combinations of a larger grazing trial. Fertiliser treatments were LF (750 kg/ha superphosphate total over the previous 4 years) and HF (1800 kg/ha total plus 1250 kg/ha ground limestone). Grazing managements were set stocking with sheep (SSS), and rotational grazing with sheep (RGS) or cattle (RGC). Annual fixation averaged 103 kg N/ha in LF and 201 kg N/ha in HF pastures, and 105,129 and 224 kg N/ha in SSS, RGS, and RGC pastures respectively. These levels were in contrast to an annual level of 34 kg N/ha measured within the same area 2 years previously, when pasture improvement was much less advanced. Annual N fixation was similar on sunny and shady aspects, but the pattern of seasonal fixati...
摘要采用乙炔还原法测定了Woodville附近balantrae hill Country研究站丘陵牧场的固氮量。从1976年9月开始，在12个月的时间里，对6种肥料×放牧管理组合的阳光和阴暗方面进行了测量，这是一个更大的放牧试验。化肥处理为低磷(前4年共750公斤/公顷过磷酸钙)和高频(1800公斤/公顷加1250公斤/公顷石灰石)。放牧管理方式为放羊(SSS)和轮牧(RGS)或轮牧(RGC)。低海拔、高海拔、高海拔牧场年平均固氮量分别为103 kg /ha和201 kg /ha, SSS、RGS和RGC牧场年平均固氮量分别为105,129和224 kg /ha。这些水平与2年前在同一地区测量的34公斤N/公顷的年水平形成鲜明对比，当时牧场改良程度要低得多。阳面和阴面的年固氮相似，但季节固氮的模式不同。
{"title":"Nitrogen fixation during improvement of North Island hill country pastures","authors":"M. G. Lambert","doi":"10.1080/03015521.1987.10425570","DOIUrl":"https://doi.org/10.1080/03015521.1987.10425570","url":null,"abstract":"Abstract Nitrogen (N) fixation was measured, using the acetylene reduction assay, in hill pastures at the Ballantrae Hill Country Research Station near Woodville. Measurements were made over a 12 month period starting in September 1976, on sunny and shady aspects of the six fertiliser × grazing management treatment combinations of a larger grazing trial. Fertiliser treatments were LF (750 kg/ha superphosphate total over the previous 4 years) and HF (1800 kg/ha total plus 1250 kg/ha ground limestone). Grazing managements were set stocking with sheep (SSS), and rotational grazing with sheep (RGS) or cattle (RGC). Annual fixation averaged 103 kg N/ha in LF and 201 kg N/ha in HF pastures, and 105,129 and 224 kg N/ha in SSS, RGS, and RGC pastures respectively. These levels were in contrast to an annual level of 34 kg N/ha measured within the same area 2 years previously, when pasture improvement was much less advanced. Annual N fixation was similar on sunny and shady aspects, but the pattern of seasonal fixati...","PeriodicalId":19285,"journal":{"name":"New Zealand journal of experimental agriculture","volume":"17 1","pages":"267-270"},"PeriodicalIF":0.0,"publicationDate":"1987-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82023885","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: 10.1080/03015521.1987.10425586
A. Tomkins, D. Penman, R. Chapman, S. Worner
Abstract An evaluation was conducted of a model (PETE) for predicting the phenology of codling moth (Cydia pomonella L.) and the lightbrown apple moth (Epiphyas postvittana (Walker)) in apple orchards in Canterbury, New Zealand. Validation data consisted of adult flights recorded with pheromone traps for codling moth, and bait trap catches and the occurrence of eggs and larvae recorded by destructive sampling of apple tree clusters for lightbrown apple moth. Key events in the life history of both pests occurred over extended periods because of mild winters affecting diapause termination for codling moth and the complete absence of diapause by the lightbrown apple moth. The model was able to reflect observed pest phenology but some problems were encountered and these are discussed.
{"title":"An evaluation of a phenological model (PETE) to assist insect pest control in apple orchards in Canterbury, New Zealand","authors":"A. Tomkins, D. Penman, R. Chapman, S. Worner","doi":"10.1080/03015521.1987.10425586","DOIUrl":"https://doi.org/10.1080/03015521.1987.10425586","url":null,"abstract":"Abstract An evaluation was conducted of a model (PETE) for predicting the phenology of codling moth (Cydia pomonella L.) and the lightbrown apple moth (Epiphyas postvittana (Walker)) in apple orchards in Canterbury, New Zealand. Validation data consisted of adult flights recorded with pheromone traps for codling moth, and bait trap catches and the occurrence of eggs and larvae recorded by destructive sampling of apple tree clusters for lightbrown apple moth. Key events in the life history of both pests occurred over extended periods because of mild winters affecting diapause termination for codling moth and the complete absence of diapause by the lightbrown apple moth. The model was able to reflect observed pest phenology but some problems were encountered and these are discussed.","PeriodicalId":19285,"journal":{"name":"New Zealand journal of experimental agriculture","volume":"44 1","pages":"381-388"},"PeriodicalIF":0.0,"publicationDate":"1987-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89209224","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 : 1987-04-01DOI: 10.1080/03015521.1987.10425561
J. Harman
Abstract The growth and chemical composition of feijoa fruit (Feijoa sellowiana Berg or Acca sellowiana) harvested at different stages of maturity were examined. Fruit growth showed a double sigmoid pattern characterised by a rapid final growth phase which lasted until abscission and fruit fall from the tree. The respiration rate of young fruit was high (120 mg CO2 kg-1h-1) but declined to a preclimacteric minimum (20–30 mg CO2 kg-1 h-1) 80–100 days after anthesis, and then increased as the fruit matured and ripened. Sugar and organic acid content of fruit harvested less than 80 days after anthesis was low but increased after 90 days, until fruit fall. Calcium, magnesium, and potassium content of feijoa fruit increased throughout maturation.
摘要对不同成熟期采收的feijoa (feijoa sellowiana Berg或Acca sellowiana)果实的生长和化学成分进行了研究。果实生长呈双s型，终末生长迅速，直至果实脱落。幼果呼吸速率较高(120 mg CO2 kg-1h-1)，但在开花后80 ~ 100 d降至绝经前最低(20 ~ 30 mg CO2 kg-1h-1)，随后随果实成熟而增加。含糖量和有机酸含量在开花后80天内较低，90天后呈上升趋势，直至落果。菲荷果的钙、镁、钾含量随着成熟而增加。
{"title":"Feijoa fruit: Growth and chemical composition during development","authors":"J. Harman","doi":"10.1080/03015521.1987.10425561","DOIUrl":"https://doi.org/10.1080/03015521.1987.10425561","url":null,"abstract":"Abstract The growth and chemical composition of feijoa fruit (Feijoa sellowiana Berg or Acca sellowiana) harvested at different stages of maturity were examined. Fruit growth showed a double sigmoid pattern characterised by a rapid final growth phase which lasted until abscission and fruit fall from the tree. The respiration rate of young fruit was high (120 mg CO2 kg-1h-1) but declined to a preclimacteric minimum (20–30 mg CO2 kg-1 h-1) 80–100 days after anthesis, and then increased as the fruit matured and ripened. Sugar and organic acid content of fruit harvested less than 80 days after anthesis was low but increased after 90 days, until fruit fall. Calcium, magnesium, and potassium content of feijoa fruit increased throughout maturation.","PeriodicalId":19285,"journal":{"name":"New Zealand journal of experimental agriculture","volume":"29 1","pages":"209-215"},"PeriodicalIF":0.0,"publicationDate":"1987-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77703739","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 : 1987-04-01DOI: 10.1080/03015521.1987.10425563
C. Yearsley, H. Mcgrath, J. Taucher, J. R. Dale
Abstract A hot water dip at 50°C for 8 min effectively controlled quiescent infections in red tamarillos (Cyphomandra betacea (Cav.) Sendt.) caused by Colletotrichum gloeosporioides (Penz.) Arx and C. acutatum Simmonds. This dip reduced the percentage of fruit with body lesions without significantly increasing peduncle necrosis. Fungi colonising damaged peduncle tissue were controlled using an imazalil dip (1 min at 15–20°C) at 250 mg active ingredient/litre. The method of imazalil application (in hot water, as a separate cold water dip, or in wax) did not affect its efficacy. Imazalil residues in skin, pulp, and whole fruit were lowest when the fungicide was applied as a separate cold water dip. Storage disorders were significantly reduced using the hot water/imazalil dip, allowing 7 days shelf-life at 20°C after 8 weeks cool storage at 3.5°C.
{"title":"Red tamarillos (Cyphomandra betacea) : post-harvest control of fungal decay with hot water and imazalil dips","authors":"C. Yearsley, H. Mcgrath, J. Taucher, J. R. Dale","doi":"10.1080/03015521.1987.10425563","DOIUrl":"https://doi.org/10.1080/03015521.1987.10425563","url":null,"abstract":"Abstract A hot water dip at 50°C for 8 min effectively controlled quiescent infections in red tamarillos (Cyphomandra betacea (Cav.) Sendt.) caused by Colletotrichum gloeosporioides (Penz.) Arx and C. acutatum Simmonds. This dip reduced the percentage of fruit with body lesions without significantly increasing peduncle necrosis. Fungi colonising damaged peduncle tissue were controlled using an imazalil dip (1 min at 15–20°C) at 250 mg active ingredient/litre. The method of imazalil application (in hot water, as a separate cold water dip, or in wax) did not affect its efficacy. Imazalil residues in skin, pulp, and whole fruit were lowest when the fungicide was applied as a separate cold water dip. Storage disorders were significantly reduced using the hot water/imazalil dip, allowing 7 days shelf-life at 20°C after 8 weeks cool storage at 3.5°C.","PeriodicalId":19285,"journal":{"name":"New Zealand journal of experimental agriculture","volume":"46 1","pages":"223-228"},"PeriodicalIF":0.0,"publicationDate":"1987-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79029465","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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