Pub Date : 1988-04-01DOI: 10.1080/03015521.1988.10425633
P. Long
Abstract Pythium myriotylum Drechsler caused a root rot of Zantedeschia elliottiana Engler, and P. butleri Subramaniam caused a root rot of Lycopersicon esculentum Miller.
{"title":"New records of Pythium species in New Zealand","authors":"P. Long","doi":"10.1080/03015521.1988.10425633","DOIUrl":"https://doi.org/10.1080/03015521.1988.10425633","url":null,"abstract":"Abstract Pythium myriotylum Drechsler caused a root rot of Zantedeschia elliottiana Engler, and P. butleri Subramaniam caused a root rot of Lycopersicon esculentum Miller.","PeriodicalId":19285,"journal":{"name":"New Zealand journal of experimental agriculture","volume":"13 1","pages":"165-166"},"PeriodicalIF":0.0,"publicationDate":"1988-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88455204","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 : 1988-03-14DOI: 10.1080/03015521.1988.10425663
C. Yearsley, B. Huang, H. Mcgrath, J. Fry, M. Stec, J. R. Dale
Abstract The fungicides imazalil and prochloraz suppressed the in vitro growth of four fungal storage pathogens of tamarillos (Colletotrichum gloeosporioides (Penz.) Arx, C. acutatum Simmonds, Phomopsis sp., and Phoma exigua Desm.). Imazalil was as effective as prochloraz against P. exigua but prochloraz was more effective against C. gloeosporioides, C. acutatum, and Phomopsis sp. The proportion of fruit affected by four storage disorders (body lesions, stem-end lesions, calyx mycelium, and calyx necrosis) was reduced after dipping with prochloraz (250–1000 mg/litre) compared with fruit dipped in cold water (CW). A combined imazalil and prochloraz dip (CF) resulted in the greatest reduction in these disorders. Fruit from one orchard were dipped and stored for4,6,and8 weeks at3.5± l° Cfollowedby 1 week at 20 ± 2° C. The number of sound fruit after storage was increased by 36% and 35% respectively for the CF strategy and the hot water dip (HW) when compared with the cold water dip (CW). In fruit that were c...
{"title":"Red tamarillos (Cyphomandra betacea): Comparison of two postharvest dipping strategies for the control of fungal storage disorders","authors":"C. Yearsley, B. Huang, H. Mcgrath, J. Fry, M. Stec, J. R. Dale","doi":"10.1080/03015521.1988.10425663","DOIUrl":"https://doi.org/10.1080/03015521.1988.10425663","url":null,"abstract":"Abstract The fungicides imazalil and prochloraz suppressed the in vitro growth of four fungal storage pathogens of tamarillos (Colletotrichum gloeosporioides (Penz.) Arx, C. acutatum Simmonds, Phomopsis sp., and Phoma exigua Desm.). Imazalil was as effective as prochloraz against P. exigua but prochloraz was more effective against C. gloeosporioides, C. acutatum, and Phomopsis sp. The proportion of fruit affected by four storage disorders (body lesions, stem-end lesions, calyx mycelium, and calyx necrosis) was reduced after dipping with prochloraz (250–1000 mg/litre) compared with fruit dipped in cold water (CW). A combined imazalil and prochloraz dip (CF) resulted in the greatest reduction in these disorders. Fruit from one orchard were dipped and stored for4,6,and8 weeks at3.5± l° Cfollowedby 1 week at 20 ± 2° C. The number of sound fruit after storage was increased by 36% and 35% respectively for the CF strategy and the hot water dip (HW) when compared with the cold water dip (CW). In fruit that were c...","PeriodicalId":19285,"journal":{"name":"New Zealand journal of experimental agriculture","volume":"3 1","pages":"359-366"},"PeriodicalIF":0.0,"publicationDate":"1988-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76086458","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 : 1988-01-01DOI: 10.1080/03015521.1988.10425609
W. Harris, H. T. Kunelius
Abstract Measurements were made of herbage dry matter production and composition of pastures in the second year after drilling of ‘Grasslands Pawera’ red clover (Trifolium pratense L.) with or without ‘Grasslands Nui’ perennial ryegrass (Lolium perenne L.) into grass-white clover dominant swards in autumn and spring. Tillage treatments included cultivated seedbed, overdrilling into paraquat-sprayed bands, and blanket spraying with paraquat or glyphosate. Unmodified resident pasture produced more total yield than the autumn-sown cultivated treatments, but yields from spring-sown treatments were not significantly lower than the resident pasture yield. Contribution of red clover to yield was 13–26% with full cultivation and 4–7% with band spraying of paraquat, but did not significantly modify the distribution of herbage production. Red clover density varied from 6 to 8 plants/m2 in band-sprayed treatments, about a third of the density obtained with full cultivation. This study indicates that interruption of ...
{"title":"Production of pastures in the second year after drilling of red clover and ryegrass","authors":"W. Harris, H. T. Kunelius","doi":"10.1080/03015521.1988.10425609","DOIUrl":"https://doi.org/10.1080/03015521.1988.10425609","url":null,"abstract":"Abstract Measurements were made of herbage dry matter production and composition of pastures in the second year after drilling of ‘Grasslands Pawera’ red clover (Trifolium pratense L.) with or without ‘Grasslands Nui’ perennial ryegrass (Lolium perenne L.) into grass-white clover dominant swards in autumn and spring. Tillage treatments included cultivated seedbed, overdrilling into paraquat-sprayed bands, and blanket spraying with paraquat or glyphosate. Unmodified resident pasture produced more total yield than the autumn-sown cultivated treatments, but yields from spring-sown treatments were not significantly lower than the resident pasture yield. Contribution of red clover to yield was 13–26% with full cultivation and 4–7% with band spraying of paraquat, but did not significantly modify the distribution of herbage production. Red clover density varied from 6 to 8 plants/m2 in band-sprayed treatments, about a third of the density obtained with full cultivation. This study indicates that interruption of ...","PeriodicalId":19285,"journal":{"name":"New Zealand journal of experimental agriculture","volume":"1 1","pages":"17-20"},"PeriodicalIF":0.0,"publicationDate":"1988-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89643437","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 : 1988-01-01DOI: 10.1080/03015521.1988.10425615
E. Burgess, E. M. W. T. Koha, R. Hutchins, Lynne Douglas
Abstract Adult grass grubs, Costelytra zealandica (White), die shortly after feeding on castor oil plant (Ricinus communis L.) leaves in the field. Chemical constituents of R. communis leaves were extracted and fractionated. A bioassay using grass grub adults confirmed that fresh R. communis leaves and some of the chemical fractions were toxic. The main toxic substance was identified by mass spectrometry as the alkaloid ricinine.
摘要在野外，成草幼虫Costelytra zealandica (White)以蓖麻属植物(Ricinus communis L.)的叶片为食后很快死亡。对芦笋叶的化学成分进行了提取和分馏。利用草蛴螬成虫进行的生物测定证实，新鲜的红叶和部分化学成分是有毒的。质谱法鉴定主要有毒物质为生物碱蓖麻碱。
{"title":"Toxicity of leaves from the castor oil plant, Ricinus communis L. (Euphorbiaceae), to adult grass grub, Costelytra zealandica (White) (Coleoptera: Scarabaeidae)","authors":"E. Burgess, E. M. W. T. Koha, R. Hutchins, Lynne Douglas","doi":"10.1080/03015521.1988.10425615","DOIUrl":"https://doi.org/10.1080/03015521.1988.10425615","url":null,"abstract":"Abstract Adult grass grubs, Costelytra zealandica (White), die shortly after feeding on castor oil plant (Ricinus communis L.) leaves in the field. Chemical constituents of R. communis leaves were extracted and fractionated. A bioassay using grass grub adults confirmed that fresh R. communis leaves and some of the chemical fractions were toxic. The main toxic substance was identified by mass spectrometry as the alkaloid ricinine.","PeriodicalId":19285,"journal":{"name":"New Zealand journal of experimental agriculture","volume":"29 1","pages":"63-66"},"PeriodicalIF":0.0,"publicationDate":"1988-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83081096","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 : 1988-01-01DOI: 10.1080/03015521.1988.10425613
R. Volz
Abstract Two sampling methods for estimating fruit number per tree were assessed on ‘Gala’ apple after the imposition of different crop levels by hand thinning. A multiple linear regression equation was developed for one of the sampling techniques relating the sample estimate and trunk cross-sectional area to the total fruit number per tree. Strong positive relationships were found between fruit numbers per tree and total yield, and the total weight of small fruit. These two relationships were similar over two seasons and two orchard sites. Weak relationships were found between fruit number per tree and average fruit weight and the total weight of medium or large fruit. These relationships varied between seasons and orchards.
{"title":"Regulation and estimation of crop load on ‘Gala’ apple trees","authors":"R. Volz","doi":"10.1080/03015521.1988.10425613","DOIUrl":"https://doi.org/10.1080/03015521.1988.10425613","url":null,"abstract":"Abstract Two sampling methods for estimating fruit number per tree were assessed on ‘Gala’ apple after the imposition of different crop levels by hand thinning. A multiple linear regression equation was developed for one of the sampling techniques relating the sample estimate and trunk cross-sectional area to the total fruit number per tree. Strong positive relationships were found between fruit numbers per tree and total yield, and the total weight of small fruit. These two relationships were similar over two seasons and two orchard sites. Weak relationships were found between fruit number per tree and average fruit weight and the total weight of medium or large fruit. These relationships varied between seasons and orchards.","PeriodicalId":19285,"journal":{"name":"New Zealand journal of experimental agriculture","volume":"1 1","pages":"47-53"},"PeriodicalIF":0.0,"publicationDate":"1988-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85608541","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 : 1988-01-01DOI: 10.1080/03015521.1988.10425614
C. Watkins, J. Harman, G. Hopkirk
Abstract The effects of post-harvest dips of lecithin in combination with calcium (Ca) on ‘Granny Smith’ apples were examined. Lecithin + Ca dips increased CO2 and decreased O2 levels in the fruit, and reduced the production of α-farnesene, but had little effect on the levels of superficial scald or the oxidation products of α-farnesene. Addition of antioxidants (ascorbic, tannic, citric or tartaric acids, or ascorbyl palmitate) to lecithin + Ca dips did not reduce superficial scald to levels comparable with those found with the commercially used antioxidant, diphenylamine. The incidence of internal breakdown was decreased by the use of lecithin, regardless of the presence of Ca or any other compound.
{"title":"Effects of lecithin, calcium, and antioxidant formulations on superficial scald and internal breakdown of ‘Granny Smith’ apples","authors":"C. Watkins, J. Harman, G. Hopkirk","doi":"10.1080/03015521.1988.10425614","DOIUrl":"https://doi.org/10.1080/03015521.1988.10425614","url":null,"abstract":"Abstract The effects of post-harvest dips of lecithin in combination with calcium (Ca) on ‘Granny Smith’ apples were examined. Lecithin + Ca dips increased CO2 and decreased O2 levels in the fruit, and reduced the production of α-farnesene, but had little effect on the levels of superficial scald or the oxidation products of α-farnesene. Addition of antioxidants (ascorbic, tannic, citric or tartaric acids, or ascorbyl palmitate) to lecithin + Ca dips did not reduce superficial scald to levels comparable with those found with the commercially used antioxidant, diphenylamine. The incidence of internal breakdown was decreased by the use of lecithin, regardless of the presence of Ca or any other compound.","PeriodicalId":19285,"journal":{"name":"New Zealand journal of experimental agriculture","volume":"146 1","pages":"55-61"},"PeriodicalIF":0.0,"publicationDate":"1988-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81717901","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 : 1988-01-01DOI: 10.1080/03015521.1988.10425607
D. Barker, D. Zhang
Abstract Some factors affecting success or failure of oversowing were examined. White clover (Trifolium repens L. ‘Grasslands Huia’), cocksfoot (Dactylis glomerata L. ‘Grasslands Wana’), and ryegrass (Lolium perenne L. ‘Grasslands Nui’) seed was placed at precise locations in a hill country sward and the appearance and survival of seedlings in response to treatments were monitored. Treatments included paraquat spraying (0.8 kg a.i./ha) before oversowing, seed placement on or below the soil surface, and pre-germination of seed. The number of seedlings established was in the order Huia > Nui > Wana, however the number of leaves per seedling was generally in the order Nui > Wana > Huia. Averaged over the three species, seedlings were larger and more abundant for sprayed treatments compared with non-sprayed treatments. Seed placed below the soil surface appeared as seedlings more rapidly than seed on the surface, but subsequent seedling development was similar for both seed placement treatments. Pre-germinate...
摘要对影响复播成败的因素进行了探讨。将白三叶草(Trifolium repens L. ' grass Huia ')、鸭蹄草(Dactylis glomerata L. ' grass Wana ')和黑麦草(Lolium perenne L. ' grass Nui ')种子放置在丘陵草地的精确位置，并监测幼苗对处理的响应。处理包括播种前喷洒百草枯(0.8 kg a.i./ hm2)、在土壤表面或地下播种和种子发芽前。建立的幼苗数量顺序为惠亚>纽亚>瓦纳，而每苗叶片数量顺序为纽亚>瓦纳>惠亚。三个树种平均而言，喷施处理的幼苗比不喷施处理的更大、更丰富。埋在土壤表层以下的种子比埋在土壤表层的种子更快地形成幼苗，但两种埋种处理的幼苗发育相似。Pre-germinate……
{"title":"The effects of paraquat spraying, seed placement, and pre-germination on the appearance and survival of white clover, cocksfoot, and ryegrass seedlings from spring oversowing in hill country","authors":"D. Barker, D. Zhang","doi":"10.1080/03015521.1988.10425607","DOIUrl":"https://doi.org/10.1080/03015521.1988.10425607","url":null,"abstract":"Abstract Some factors affecting success or failure of oversowing were examined. White clover (Trifolium repens L. ‘Grasslands Huia’), cocksfoot (Dactylis glomerata L. ‘Grasslands Wana’), and ryegrass (Lolium perenne L. ‘Grasslands Nui’) seed was placed at precise locations in a hill country sward and the appearance and survival of seedlings in response to treatments were monitored. Treatments included paraquat spraying (0.8 kg a.i./ha) before oversowing, seed placement on or below the soil surface, and pre-germination of seed. The number of seedlings established was in the order Huia > Nui > Wana, however the number of leaves per seedling was generally in the order Nui > Wana > Huia. Averaged over the three species, seedlings were larger and more abundant for sprayed treatments compared with non-sprayed treatments. Seed placed below the soil surface appeared as seedlings more rapidly than seed on the surface, but subsequent seedling development was similar for both seed placement treatments. Pre-germinate...","PeriodicalId":19285,"journal":{"name":"New Zealand journal of experimental agriculture","volume":"7 1","pages":"1-9"},"PeriodicalIF":0.0,"publicationDate":"1988-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87057260","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 : 1988-01-01DOI: 10.1080/03015521.1988.10425616
G. Kenny, R. Chapman
Abstract A field experiment to investigate the effects of crop diversity on the insect pests and yield of cabbage, Brassica oleracea var. capitata, was carried out at Lincoln College, Canterbury. All treatments were based on a standard cabbage plant spacing of 50 cm within rows and 100 cm between rows. Treatment 1 remained untreated; Treatment 2 was sprayed with 1.0 kg/ha Bacillus thuringiensis (Thuricide HP) at fortnightly intervals; Treatment 3 was intercropped with dill (Anethum graveolens); Treatment 4 was cabbage planted between standard rows, i.e., double the density in Treatment 1. Regular monitoring showed fewer white butterfly (Pieris rapae L.) eggs were laid on cabbages planted at the higher density and fewer alate cabbage aphids (Brevicoryne brassicae L.), occurred on plants intercropped with dill. Diamondback moth (Plutella xylostella L.) was not a prevalent pest. Applications of Bacillus thuringiensis resulted in improved cabbage quality but not increased yields. Lowest ‘per plant’ yields occ...
摘要在坎特伯雷林肯学院进行了作物多样性对甘蓝(Brassica oleracea var. capitata)病虫害及产量的影响。所有处理均以行内50厘米、行间100厘米的标准白菜植株间距为基础。治疗1仍未治疗;处理2每两周喷施1.0 kg/ha苏云金芽孢杆菌(杀苏云金杆菌HP);处理3间作莳萝(茴香);处理4在标准行之间种植白菜，即密度为处理1的两倍。定期监测结果显示，高密度种植的白菜上产白蝴蝶卵较少，间作莳蕾的白菜上产白蝴蝶蚜较少。小菜蛾(Plutella xylostella L.)是一种不常见的害虫。苏云金芽孢杆菌的施用改善了白菜的品质，但没有提高产量。“每株”产量最低……
{"title":"Effects of an intercrop on the insect pests, yield, and quality of cabbage","authors":"G. Kenny, R. Chapman","doi":"10.1080/03015521.1988.10425616","DOIUrl":"https://doi.org/10.1080/03015521.1988.10425616","url":null,"abstract":"Abstract A field experiment to investigate the effects of crop diversity on the insect pests and yield of cabbage, Brassica oleracea var. capitata, was carried out at Lincoln College, Canterbury. All treatments were based on a standard cabbage plant spacing of 50 cm within rows and 100 cm between rows. Treatment 1 remained untreated; Treatment 2 was sprayed with 1.0 kg/ha Bacillus thuringiensis (Thuricide HP) at fortnightly intervals; Treatment 3 was intercropped with dill (Anethum graveolens); Treatment 4 was cabbage planted between standard rows, i.e., double the density in Treatment 1. Regular monitoring showed fewer white butterfly (Pieris rapae L.) eggs were laid on cabbages planted at the higher density and fewer alate cabbage aphids (Brevicoryne brassicae L.), occurred on plants intercropped with dill. Diamondback moth (Plutella xylostella L.) was not a prevalent pest. Applications of Bacillus thuringiensis resulted in improved cabbage quality but not increased yields. Lowest ‘per plant’ yields occ...","PeriodicalId":19285,"journal":{"name":"New Zealand journal of experimental agriculture","volume":"37 1","pages":"67-72"},"PeriodicalIF":0.0,"publicationDate":"1988-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84930100","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 : 1988-01-01DOI: 10.1080/03015521.1988.10425620
S. Pung, M. Barbetti, K. Sivasithamparam
Abstract The occurrence of the root-knot nematode (Meloidogyne spp.) on subterranean clover in the lower south-west of Western Australia, and its association with root rot of this pasture species were investigated. Meloidogyne arenaria was associated with roots of subterranean clover sampled from all 12 field sites. This is the first record of M. arenaria on subterranean clover in Australia or elsewhere. There was a negative relationship between gall and root rot indices of the tap roots but not of the laterals. Although pathogenicity tests with M. arenaria at five inoculum levels (0, 8, 16, 40, and 80 × 102 eggs per 250 cm3 pot) showed that it is pathogenic at higher inoculum levels (> 16 × 102 eggs per pot), none of these levels resulted in root necrosis.
{"title":"Association of Meloidogyne arenaria with root rot of subterranean clover in Western Australia","authors":"S. Pung, M. Barbetti, K. Sivasithamparam","doi":"10.1080/03015521.1988.10425620","DOIUrl":"https://doi.org/10.1080/03015521.1988.10425620","url":null,"abstract":"Abstract The occurrence of the root-knot nematode (Meloidogyne spp.) on subterranean clover in the lower south-west of Western Australia, and its association with root rot of this pasture species were investigated. Meloidogyne arenaria was associated with roots of subterranean clover sampled from all 12 field sites. This is the first record of M. arenaria on subterranean clover in Australia or elsewhere. There was a negative relationship between gall and root rot indices of the tap roots but not of the laterals. Although pathogenicity tests with M. arenaria at five inoculum levels (0, 8, 16, 40, and 80 × 102 eggs per 250 cm3 pot) showed that it is pathogenic at higher inoculum levels (> 16 × 102 eggs per pot), none of these levels resulted in root necrosis.","PeriodicalId":19285,"journal":{"name":"New Zealand journal of experimental agriculture","volume":"10 1","pages":"91-96"},"PeriodicalIF":0.0,"publicationDate":"1988-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74324591","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 : 1988-01-01DOI: 10.1080/03015521.1988.10425617
D. Barker, D. Zhang, A. Mackay
Abstract In a preliminary study, root distribution, biomass, length, and surface area were measured to a depth of 800 mm in mid summer on a sunny (north) and shady (south) aspect of a low fertility hill country sward grazed by sheep. The dominant grass species were browntop (Agrostis capillaris L.), crested dogstail (Cynosurus cristatus L.), and yorkshire fog (Holcus lanatus L.). White clover (Trifolium repens L.), suckling clover (T. dubium Sibth. L.)( and lotus (Lotus pedunculatus Cav.) were the dominant legume species. Calculated root biomass for the profile down to 800 mm was 14 410 kg dry matter (DM)/ha on the shady face and 21 470 kg DM/ha on the sunny face. This was 2.3–3.5 times more than above-ground biomass produced on an annual basis and 6–7 times the total above-ground pasture biomass at the times of sampling. The large root biomass, and consequently the large quantities of nutrients involved in the below-ground component of the nutrient cycle, highlight the need for further research to quanti...
{"title":"Root distribution in a low fertility hill country sward grazed by sheep","authors":"D. Barker, D. Zhang, A. Mackay","doi":"10.1080/03015521.1988.10425617","DOIUrl":"https://doi.org/10.1080/03015521.1988.10425617","url":null,"abstract":"Abstract In a preliminary study, root distribution, biomass, length, and surface area were measured to a depth of 800 mm in mid summer on a sunny (north) and shady (south) aspect of a low fertility hill country sward grazed by sheep. The dominant grass species were browntop (Agrostis capillaris L.), crested dogstail (Cynosurus cristatus L.), and yorkshire fog (Holcus lanatus L.). White clover (Trifolium repens L.), suckling clover (T. dubium Sibth. L.)( and lotus (Lotus pedunculatus Cav.) were the dominant legume species. Calculated root biomass for the profile down to 800 mm was 14 410 kg dry matter (DM)/ha on the shady face and 21 470 kg DM/ha on the sunny face. This was 2.3–3.5 times more than above-ground biomass produced on an annual basis and 6–7 times the total above-ground pasture biomass at the times of sampling. The large root biomass, and consequently the large quantities of nutrients involved in the below-ground component of the nutrient cycle, highlight the need for further research to quanti...","PeriodicalId":19285,"journal":{"name":"New Zealand journal of experimental agriculture","volume":"51 1","pages":"73-76"},"PeriodicalIF":0.0,"publicationDate":"1988-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74152259","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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