Study on availability of ground rock phosphate in combination with some organic manures (I) Sansai soil (II) Upland soil of Prao and Jomtong districts Chiang Mai province [Thailand]
1992
Chalood Tharathabhand | Suphat Wankhrua | Pongpan Chungyusuk (Chiang Mai Field Crops Research Center (Thailand))
Study on availability of ground rocks phosphate in the combinating use with some organic manures was carried out in Sansai soil of CMFCRC in 1987-1989 and in 1989. The residues phosphate in Sansai soil could not show the influence of any organic manure on rock phosphate availability. Municipal compost gave higher yield of soybean production than that of other manures or chemical fertilizer and control. Besides, it found that bionic compost and municipal compost raised up the soil pH. OM. and soil phosphorous accumulation. Reddish brown lateritic soil at Prao district, Any rate of rock phosphate application and any kind of manures and chemical fertilizer even check did not affect on growth of soybean significantly both at V3 and R4-R5 stages. The best rate of rock phosphate application is 400 or 200 kg/rai by the first year and bionic compost gave highest yield of dry soybean seed followed by municipal compost. Korat/Sanpatong soil were not satisfied because of heavy rain precipitate during the early stage of soybean growth causing ununiformly plant growth and yield.
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