Fertilizer Response and Economic Return of Cassava Variety Kasetsart 50

Abstract

A field experiment was conducted to investigate effects of mixed fertilizer 15-15-15 on growth, yield and economic return of 3 cassava varieties named Rayong 1, Rayong 60 and Kasetsart 50. Field trial was putup was on loamy sand soil (Phungdaeng soil series) during June 1991 to June 1992 inside the Sitthiporn Krisdakorn research station, Kasetsart University, Prajuabkirikhun province. The experimental results showed that all 3 cassava varieties showed very marked response to fertilizer either at the same rate orincre asing rate from nil to 50, 100, 150 and 200 kg/rai. Fertilizer rateat which all cassava varieties gave the highest response and economic return was 50 kg/rai. The fertilizer response and economic return were decreased as fertilizer from 50 to 200 kg/rai. Cassava variety Kasetsart 50 gave higher starch content in fresh root and higher starch yield than Rayong land Rayong 60 whereas its fresh and dry root yield were comparable to Rayong 60. As compare to Rayong 1, Kasetsart 50 contained higher starch content in fresh root and produced higher fresh root yield, dry root yield and starch yield by 24, 9, 31 and 35 percent respectively.