Potassium Status in Barnyard Manure,Crop Residue and Green Manure and Their Capability of Supplying Potassium to Soil and Crop

doi:10.3321/j.issn:1000-7091.1999.04.016

Abstract

Abstract: The status of total K,rapidly available K and slowly available K contents in five conventional organic fertilizers,e.g.,cattle manure,pig manure,chicken manure,crop residue and green manure,as potassium sources were reported in this paper.And the effects of the mentioned K resources on K supplying capability of soil and crop were studied.The following conclusions were developed from the obtained results.(1) The 5 kinds of K sources contented 0.85%～4.50% of total K,among which 32.7～69.7% was rapidly available K,1.7%～25.0% was slowly available K.(2)After 150 days of culturing,50%～80% of the rapidly and slowly available K still existed in the soil as the two forms,but the rapidly available K proportion decreased evidently and the slowly available K proportion increased significantly,and their extent was related to the K source kinds and soil types.(3)All kinds of mentioned organic fertilizer increased the dry weight and absorbed amount of K of corn seedling.(4)The effect on K supplying of organic fertilizer was more clearly related to soil slowly available K.

Key words: Manure, Crop residue, Green manure, Potassium content status, Potassium supply capability

CLC Number:

S143.3

Zhou Xiaofen, Zhang Yancai, Li Qiaoyun, Bu Fengji. Potassium Status in Barnyard Manure,Crop Residue and Green Manure and Their Capability of Supplying Potassium to Soil and Crop[J]. ACTA AGRICULTURAE BOREALI-SINICA, 1999, 14(4): 83-87. doi: 10.3321/j.issn:1000-7091.1999.04.016.

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