Nutrient movement in sandy soil
1987
Nonglak Vibulsukh | Puanglek Morakul | Wisit Cholitkul (Department of Agriculture, Bangkok (Thailand). Soil Science Div. Soil Chemistry and Fertility Group)
Lysimeter trial was conducted to study the movement of plant nutrients in warin soils by growing suwan-l corn and rice bean as successing crop. Chemical fertilizer, rice straw compost and organic material mulching were appliced. Nutrient movement depended on the amount of rainfall and percolation rate. The percolation rate was hign at the beginning of the study and gradually decreased as plant growth increased. The leaching of nitrate was related to the amount of nitrogen fertilizer application. Other than nitrate, many plant nutrients such as Na, K, Ca, Mg, Cl and SO4 were also leached down along with percolated water to 1 m. depth. Phosphate movement in sandy soil was somewhat observed at only within 50 cm from the surface. Compost application and organic mulching caused the better germination, initial growth, yield and nutrient uptake of corn than no mulch. Rice bean grown as successing crop prevented leaching loss of nutrients and increased nitrogen in the soil by fixation.
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