21. |
Apple replant disease: the assessment and results of seedling bio‐assays of growth responses to soil fumigation with chloropicrin |
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Annals of Applied Biology,
Volume 121,
Issue 1,
1992,
Page 199-209
G. W. F. SEWELL,
A. L. ROBERTS,
R. F. ELSEY,
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摘要:
SummaryThe effects of chloropicrin fumigation of field soils before replanting apple are frequently predicted from bio‐assays using pot‐grown apple seedlings. The results of 506 such bio‐assays carried out during 12 years are discussed with reference to modifications which were made to the test method. The interpretation of the most recent and valid bio‐assay results is considered in relation to the different purposes for which such tests may be conducted.When all test soils were amended with phosphorus (to compensate for the eradication of vesicular‐arbuscular mycorrhizal fungi by fumigation) the proportion of old orchard soils yielding economically significant growth responses increased from 39% to 68%. When, additionally, plant growth was assessed by shoot fresh weight (rather than shoot length) the proportion further increased to 82%.The traditional method of expressing growth responses to soil sterilisation, as proportionate growth increases, was found to be subject to skewing effects of non‐biological fertility factors; this feature was avoided when results were given as actual growth increases. The latter value therefore is considered preferable when assessing the relative disease status of soils for etiological purposes (as opposed to predicting the cost‐benefits of field soil treatment).The data indicated that disease severity was on average diminished in the most acidic soils (pH 4.8–6.1), but did not support the generalisation that disease severity increases progressive
ISSN:0003-4746
DOI:10.1111/j.1744-7348.1992.tb04001.x
出版商:Blackwell Publishing Ltd
年代:1992
数据来源: WILEY
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22. |
The description of the growth stages of annual grass weeds |
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Annals of Applied Biology,
Volume 121,
Issue 1,
1992,
Page 211-214
H. M. LAWSON,
M. A. READ,
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摘要:
SummaryThe decimal code for the growth stages of cereal crops, devised by Zadoks, Chang&Konzak (1974) and expanded by Tottman&Makepeace (1979) and Tottman (1987) was found to be generally applicable to annual graminaceous species encountered as arable weeds in the United Kingdom. For the great majority of growth stages no difficulties were found in using the Zadoks code, but agronomists, crop protection advisers and farmers identified practical problems in assessing the transition from tillering to stem elongation to node development in certain species. It is recommended that these problems could be minimised if label and advisory statements avoided the use of GS30 ‐ pseudostem (leaf sheath) erection ‐ as a growth stage description for annual grass weeds. The benefits of being able to use one key for graminaceous crops and weeds in the United Kingdom considerably outweigh any inconvenience caused by the need to amend herbicide labels to achieve this object
ISSN:0003-4746
DOI:10.1111/j.1744-7348.1992.tb04002.x
出版商:Blackwell Publishing Ltd
年代:1992
数据来源: WILEY
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23. |
An Appreciation |
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Annals of Applied Biology,
Volume 121,
Issue 1,
1992,
Page 215-217
J. M. Hirst,
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ISSN:0003-4746
DOI:10.1111/j.1744-7348.1992.tb04003.x
出版商:Blackwell Publishing Ltd
年代:1992
数据来源: WILEY
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24. |
ASSOCIATION OF APPLIED BIOLOGISTS |
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Annals of Applied Biology,
Volume 121,
Issue 1,
1992,
Page 219-219
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ISSN:0003-4746
DOI:10.1111/j.1744-7348.1992.tb04004.x
出版商:Blackwell Publishing Ltd
年代:1992
数据来源: WILEY
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25. |
Annals of Applied Biology: Board of Editors |
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Annals of Applied Biology,
Volume 121,
Issue 1,
1992,
Page 220-220
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ISSN:0003-4746
DOI:10.1111/j.1744-7348.1992.tb04005.x
出版商:Blackwell Publishing Ltd
年代:1992
数据来源: WILEY
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26. |
ASSOCIATION OF APPLIED BIOLOGISTS: Notice to Contributors |
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Annals of Applied Biology,
Volume 121,
Issue 1,
1992,
Page 223-224
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ISSN:0003-4746
DOI:10.1111/j.1744-7348.1992.tb04006.x
出版商:Blackwell Publishing Ltd
年代:1992
数据来源: WILEY
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27. |
NOTE |
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Annals of Applied Biology,
Volume 121,
Issue 1,
1992,
Page 224-224
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ISSN:0003-4746
DOI:10.1111/j.1744-7348.1992.tb04007.x
出版商:Blackwell Publishing Ltd
年代:1992
数据来源: WILEY
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