Abstract
This study aimed to clarifying about distribution of application amounts of fertilizer ingredient in cow-wheat straw composts on large scale felds.The experiments carried out at three farmer's fields in Tokachi district,Hokkaido.Cow-wheat straw compost was broadcasted using manure spreader,and compost application rates and amounts of N,P2O5 and K2O of compost per square meter were measured.Variation coefficients of compost application rates were 57.8-63.9%.Amount of N of compost had difference of 7-21 times.The differences of P2O5 and K2O were 7-22 times and 8-23 times as well as amount of N including compost.From the above results,it was cleared that the very heterogeneous distribution of amounts of fertilizer ingredients in cow-wheat straw compost in a field was shown.Change of amounts of fertilizer ingredient in cow-wheat straw compost was specified to compost application rate.And it was suggested that compost application rate is influenced of water content and C/N ratio of composts.Equalization of amounts of fertilizer ingredient in cow-wheat straw compost is one of the important agricultural technologies to the stabilization of the crop production in cultivation.In order to solve the problem of heterogeneous of compost application rates,it was considered that the valuation basis of the physio-chemical property of compost decides is necessity.
