Effect of Organic Fertilizer from Central Waste Water Treatment of Saha Group Industrial Park on Growth and Yield of Cassava

Abstract

This study investigated the effect of organic fertilizer (OF) from Central Waste Water Treatment of Saha Group Industrial Park on growth, yield of cassava (var. Huay Bong 60) and some soil properties planted in Kamphaeng Saen series. The experimental design was arranged in Randomized Complete Block (RCB) with 3 replications and consisted of 10 treatments. The results showed that the application of OF-B of 350 kg/rai in combinations with chemical fertilizers containing all major elements equivalent to 350 kg/rai of the OF-B provided the highest of plant height, branches/plant, leaf greenness (SPAD reading), fresh root yield, average weight/root, starch contents, starch yield and concentration of N in fresh root which was not significantly different from the application of OF-B of 700 kg/rai  and the application of OF-D of 350 kg/rai in combinations with chemical fertilizers containing all major elements equivalent to 350 kg/rai of the OF-D. After experiment, it was found that all treatments that applied chemical fertilizers or OF both single use or in combination with chemical fertilizers as well as the control treatment effected on chemical properties of soil: a) soil pH was slightly alkaline to moderately alkaline; b) the electrical conductivity (EC_e) of soil was non-saline; c) the organic matter of soil was low to moderately; d) the available P of soil was very high; and e) the exchangeable K of soil was moderately to high. Furthermore, the application of OF-B of 700 kg/rai provided the highest of exchangeable Na of soil which was not significantly difference from the application of OF-D and OF-C of 700 kg/rai.