北海道の火山性土に立地した草地に対する低投入持続型カリウム施肥の可能性

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The possibility of potassium appication on grassland in Andosol for low-input sustainable agriculture is discussed. The application of 300 kg ha^<-1> y^<-1> of potassium as an exchangeable fertilizer in 0-5 cm soil has been rcommended to maintain high dry matteryield. Eighty out of 300 kg ha^<-1> of exchangeable potassium has been required since 220 kg ha^<-1> y^<-1> of potassium as fertilizer is needed in Hokkaido. In this study, a potassium application test was carried out on a timothy-legume mixture in the Konsen district in order to estimate the feasibility of reduced potassium application. The amount of potassium required to maintain a stable legume ratio, which is important in maintaining grasslands over the nolg term, was less than that for high dry matter yield. Reduced potassium application made the potassium content of forage lower, the calcium and magnesium content higher, and as a result, the mineral balance of forage better although it decreased dry matter yield. Eighty kg ha^<-1> of Potassium in 0-5 cm soil could not be maintained because of uptake by timothy. Moreover, the amount of exchangeable potassium in autumn decreased until the next spring.It is important to estimate the minimum application of potassium for a stabl legume ratio, and to clarify the amount of exchangeable potassium in the soil for stable fertility and conservation of the environment. Potassium applicaion is expected to be reduced on the bsis of the results of these experiments.
社団法人日本土壌肥料学会の論文
1996-06-05

北海道の火山性土に立地した草地に対する低投入持続型カリウム施肥の可能性

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