Survey and analysis of soil samples in peanut growing areas
1985
Chairerk Suwannarat | Amnat Suwanarit | Chamchan Vijarnsorn (Kasetsart Univ., Bangkok (Thailand). Faculty of Agriculture)
Six out of ten paddy soil samples collected from the North, particularly from Lamphun and Lampang Provinces, are deficient in phosphorus. In these soils, the available P contents extractable by Bray-II extractant are in the range of 3-9 ppm. The results of chemical analysis of two of the four paddy soil samples collected from Kalasin revealed that these soils contain relatively low content of phosphorus extractable by Bray-II method (3 and 8.2 ppm P). Eventhough fertilization was made in this case, still peanut pod yeilds were relatively low (1375 kg/ha.). The nutrient constraints limiting crop growth and yield in these soils are likely to be Mn and Cu deficiencies. Application of chicken manure in addition to chemical fertilizer (N-P-K) resulted in an increase of peanut pod yield from 1125 kg/ha. when only chemical fertilizer was applied to 2188 kg/ha. It seemed probable that chicken manure might be used to correct, or at least to alleviate, the problems of micronutrient deficiency of these soils. For two upland soil samples collected from Lop Buri, peanut pod yields were very low (940 and 870 kg/ha.). The analyses showed that the soils were very low in DTPA-extractable iron contents (7.2 and 7.6 ppm Fe) and these could limit growth and yield of penut grown in these soils.
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