Utilization of organic waste materials for calcareous soil improvement
1992
Jongruk Chanchareonsook | Sorasith Vacharotayan | Chairerk Suwannarat | Suthep Thongpae (Kasetsart Univ., Bangkok (Thailand). Faculty of Agriculture. Dept. of Soils)
Use of organic waste materials for improvement the nitrogen fertility status of Lop Buri paddy soil, a calcareous soil was comparative studied with Nakhon Pathom paddy soil, a slightly acid soil. The orgainc waste materials examined were : i) Humus (the waste material from monosodium glutamate factory) ii) glutamic acid mother liquor (the waste material from monosodium glutamate factory) from two factories (GML1, GML2) and iii) chicken manure : The investigation was carried out in laboratory experiment and pot experiment. GML, Humus and chicken manure significantly increased NH+4 content in Lop Buri soil, a calcareous paddy soil. The amount of NH+4 in Lop Buri soil amended with the waste materials decreased as following order : GML Humus chicken manure. The effectiveness of GML in increasing the amount of NH+4 in the soil and grain yield of rice plant in Lop Buri soil was the same as that of (NH4)2SO4 but higher than that of urea. Growth yield and total N uptake of rice plant grown in Lop Buri soil amended with GML was higher than those of rice plant grown in this soil amended with Humus and chicken manure. The results from Nakhon Pathom paddy soil, a slightly acid soil, were rather similar to those in Lop Buri soil. However, the effectiveness of GML in increasing NH+4 content in this soil was higher than those of (NH4)2SO4 and urea. The efficiency of GML in increasing yield of rice in Nakhon Pathom soil was rather equal to those of (NH4)2SO4 and urea.
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