|Table of Contents|

Estimation of N,P,K Safe Content and Control of Fertilizer Rate at Seedling Stage of Cowpea

《北方园艺》[ISSN:1001-0009/CN:23-1247/S]

Issue:
2020年19
Page:
8-15
Research Field:
Publishing date:

Info

Title:
Estimation of N,P,K Safe Content and Control of Fertilizer Rate at Seedling Stage of Cowpea
Author(s):
ZHANG Zhongwu1; SUN Xincheng1; KANG Jie1; YANG Lianyong1; DENG Zhengchun2; CHEN Weiping1
(1.Changde Agriculture and Forestry Science Academy，Changde，Hunan 415000；2.Changde Agricultural Society，Changde，Hunan 415000)
Keywords:
cowpea; fertilization; safety
PACS:
-
DOI:
10.11937/bfyy.20194787
Abstract:
To estimate the N,P,K safe content at seedling stage of cowpea and scientifically guide fertilization，this study counted the contents of available nitrogen phosphorus and potassium in the soil and cavity rate of cowpea seedling under different fertilization levels using ‘Zhanjiang 215’ cowpea and five kinds of fertilizers as test materials.The results showed that the fertilizer level not only affected the nitrogen，phosphorus and potassium content in soil，but also affected the survival rate of cowpea after transplanting.Compound fertilizer had the greatest effect on soil fertility.The more the application，the higher the available nitrogen，phosphorus and potassium content，the higher the cavity rate.The available N,P,K content and the cavity rate could be expressed by the linear relationship of Y=0.007N-0.166，Y=0.007P-0.151 and Y=0.003K-0.199，respectively.The upper limit values of available N,P,K content in soil which the cowpea seedlings did not cause by fertilizer harm were 42.034，39.748，99.106 mg?kg-1，respectively.The amount per square meter of compound fertilizer (18-18-18) and the available NPK content in soil could be expressed by functional equations X=0.997N-11.315，X=1.042P-10.792 and X=0.427K-13.083，respectively.On the basis of applying organic fertilizer and other fertilizers，the maximal amount of compound fertilizer should be controlled within 29.24 g?m-2.

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Last Update: 2020-12-23