| dc.description.abstract | This Study is a part of program series on the establishment and development of N, P, and K fertilizer recommendation for dry land food crops (dry land rice, corn, and soybean) on acit tropical soils based on soil and crop characteristics. Results of the preceding correlation study showed that the use of N-Kjeldahl and C-Walkley&Black extraction method - to determine, respectively, soil total nitrogen and organic carbon or organic matter - gave a sigiificant correlation with nitrogen absorption of the test plant. The content of soil organic-C can be used to estimate the availability of soil nitrogen since almost all of the soil nitrogen is found in the fonn of organic compounds. | id |
