Plant nutrient removal of rice cultivated in acid sulfate soils,: the amount of plant nutrient removed in straw and grains of five varieties of rice [in Thailand]
Praphit Saengthong | Ninpraphai Chanthanaphap | Chakkaphong Choemsiri
The removal of nutrients in rice plant grown on acid sulphate soil was studied. The plant materials of 5 rice varieties, namely, Khao Dawk Mali, RD7 Khao Setti, Khao Tah Haeng, Leb Mae Nahng and Tapow Gaew were collected from each 2 rai farmer's field. The plant was divided in four parts: (1) filled grain; (2) unfilled grain; (3) upper part of stem and (4) lower part of stem. Each plant part was subjected to chemical analysis. The data showed that the amounts of nitrogen, phosphorus, potassium, calcium, magnesium and manganese uptake are greater in R D.7 and the amounts of these elements in the lower part of the stem that are left in the field are also greater in R D.7 than in the other varieties. Between these elements it was found that the nitrogen, phosphorus and potassium uptake are averaged at about 5.8, 1.4 and 9.1 kilograms per rai and only 14.5, 10.0 and 28.5 percent of total uptakes are left in the field. For calcium and magnesium, the average of uptake are 1.5 and 1.4 kilograms per rai and the amount in the straw are approximately 38 and 23 percent of the total uptake. The total uptake of iron, manganese and sodium are 1.1, 0.2 and 1.5 kilograms per rai. The amounts in the straw are 3.6, 26.3 and 5.9 percent of total uptake
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