Study on nutrient deficiencies of peanut in Korat soil [Thailand]
1985
Pirmpoon Keerati-kasikorn (Khon Kaen Univ., Khon Kaen (Thailand). Faculty of Agriculture)
Omission trial was conducted to determine the nutrient deficiencies of peanut in Korat soil. The treatments included All; All-K; All-Zn, Cu, Co; All-B; All-Mg, Mo; All+lime; and Nil. The trial was conducted at two locations,one at Ban Nong Kouy, Amphur Muang and the other at Ban Dong Bung, Amphur Khao Suan Kwang, Khon Kaen. At planting, peanut seeds were inoculated with three strains of rhizobium (NC 92, THA 205 and TAL 1000). No response of peanut yield was found among the various treatments. However, the amount of nitrogen fixed and nodule dry weight were less in the molybdenum and magnesium omitted treatment. Leaf tissue analysis indicated that magnesium was in an adequate supply. Thus, the effect on nitrogen fixation and nodule dry weight could be due to the inadequacy of molybdenum. Copper contents of the leaves in the copper added treatments (e.g. All, All-Mg, Mo) were found to be lower than that of the non-fertilized plots. All+lime treatment increased the copper content substantially. Copper availability was affected by some factors in the soil. Only small percentage of nodules were formed by the inoculated rhizobium strains, thus, the majority of the nodules formed were those of the indigenous strain.
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