Nitrogen behavior in tropical wetland rice oryza sativa soils 1. nitrogen supplying capacities

Kai, H.; Masayna, W.; Yamada, Y.

Fertilizer Research 5(3): 259-272


Accession: 005986004

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Laboratory and greenhouse pot experiments show that tropical wetland rice soils are very diverse in the inherent fertility. The mineralization of native soil N differed among the soils studied. Air-drying and oven-drying of soils resulted in a large increase in N mineralized. The main source of mineralized N was the amino acid and amino sugar fractions. N uptake by rice was well correlated with N mineralized in incubation of air-dried soil which should reflect accurately the N-supplying capacities of tropical wetland rice soils during the growing season. Plant uptake of available soil N was also correlated with total N content of soils, and total soil N, which is simple to determine apparently is a satisfactory index of the N supplying capacities of tropical wetland rice soils. Exclusion of problem soils like acid sulfate soils improved the correlation.