Effect of Potassium Fertilizer on Yield and Starch Quality of Cassava in Sandy Loam Soil at Kamphaeng Phet Province
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Abstract
Potassium plays a crucial role as a macronutrient in facilitating carbohydrate transport, enhancing the starch content, and promoting cassava yield. The objective of this study was to investigate the effect of potassium fertilizer on yield and starch content of cassava in sandy loam soil at Kamphaeng Phet province. The experimental design was split plot in RCB with 4 replications. Main plots comprised of CMR 53–106–24 and Rayong 15 cassava varieties. Sub plots were three levels of potassium fertilizers base on soil test: (1) 16 kg K2O/rai (the recommended rate based on soil test as control treatment) (2) 24 kg K2O/rai and (3) 32 kg K2O/rai, and all treatment were applied to nitrogen and phosphorus fertilizer based on soil test at 16 kg N/rai and 8 kg P2O5/rai, respectively. The result showed that the interaction effect of cassava variety and potassium fertilizer was not significant on yield and starch quality. The application of 24 kg K2O/rai of potassium fertilizer resulted in the highest yields of fresh tubers, starch yield, and harvest index. To achieve a favorable yield while taking into account the cost of fertilizer, it is recommended to apply potassium fertilizer at a rate of 24 kg K2O/rai to the cassava varieties CMR 53–106–24 and Rayong 15. Therefore, growing of CMR 53–106–24 and Rayong 15 and fertilizing at the recommended rate of 16–8–24 kg N–P2O5–K2O/rai was suitable practice for cassava production in sandy loam soil at Kamphaeng Phet province.
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