STUDIES ON CONTROLLED POTASSIUM FERTILIZERS : I. Relative Effectiveness of Various Hardly Soluble Potassium Compounds as Source of Slow-release

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Relative effectiveness of various hardly soluble K materials as sources of slow availability for plants was compared by uptake of K in Brassica seedlings grown in quartz sand-nutrient medium with occasional leaching, and by the release pattern of K. Material characteristics exert a great influence on K availability. Water solubility is not a dominant factor for controlling the availability of K to the plants, but particle sizes and the reaction of K in fertilizers with nutrient ions in the medium play a significant role in the release pattern of K. Moreover, the plant roots have an ability to accelerate K release from such hardly soluble sources as fused potassium phosphate, KMgPO_4,and K_2CaP_2O_7. According to the results obtained, that is, total dry matter production, pattern of K uptake through four successive croppings and loss of K by leaching the examined materials appear to be divided into the following three groups : a) Materials having a high degree of slow availability-KMgPO_4 (+3 mesh), fused potassium phosphate (+28 mesh and -65 mesh), K_2CaP_2O_7 (+3 mesh), and calcined potassium phosphate (-7+14 mesh). b) Materials having a mid degree of slow availability-KCaPO_4 (+3 mesh), liparite potassium. Sulphur coated KCl, calcined potassium phosphate (-32 mesh), K_2CaP_2O_7 (-32 mesh), KMgPO_4 (-32 mesh), and KPO_3 (+3 mesh). c) Materials having a low degree of slow availability-KCaPO_4 (-32 mesh), KPO_3 (-32 mesh).
社団法人日本土壌肥料学会の論文

STUDIES ON CONTROLLED POTASSIUM FERTILIZERS : I. Relative Effectiveness of Various Hardly Soluble Potassium Compounds as Source of Slow-release

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