Development and Conservation of Soil Fertility of Cultivated Soils of the East Region of Thailand

Abstract

Conservation of soil fertility of a sandy loam soil, Ban Bueng Soil series, through incorperation of crop residue (excluded economic yield) into soil as in greenhouse condition from, namely, continuous corn 4 crops, cont. sugarcane 2 crops, cont. cassava 2 crops, cont. ground nut 4 crops and cont. mungbean 4 crops for 2 years and then incubation of soil at moist condition for 3 months, found that only sugarcane cultivation with returning all crop residue back into soil could reduced bulk density, increased organic matter content, total nitrogen (from chemical fertilizer added) and exchangeable potassium (from chemical fertilizer added) but all other crop cultivations were failed to conserved soil fertility level of this sandy loam soil. Two experiments on increasing efficiency of N P K of chemical fertilizer applied together incomplete organic compost (“Com B”) to sandy loam soils, Ban Bueng, Hup Kapong, Stuk-soil series, in greenhouse condition with corn as inicator crop. found that the high rate of added organic compost, 5% volume (of surface soil) could increased the efficiency of N P K in chemical fertilizer added to these sandy loam soils.