Evaluation of Varieties and Suitable Organic Fertilizer Rates for Organic Cassava Production
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Abstract
Growing cassava in an organic system to achieve suitable yields and economic efficiency requires knowledge about the appropriate varieties and the proper rates of organic fertilizers. This research aims to evaluate cassava varieties and study the suitable rates of organic fertilizers for growing cassava in an organic system. The research was conducted at the Organic Crop Research Center, Ubon Ratchathani Agricultural Research Center, Ubon Ratchathani Province, through three experiments: 1) The identification of suitable cassava varieties for cultivation in organic systems, the experimental design was a randomized complete block (RCB) with 7 treatments and 3 replications. The varieties were Rayong 7, Rayong 72, Rayong 11, Rayong 86-13, Rayong 15, Huay Bong 60, and Kasetsart 50. 2) The study of the optional rates of aerated compost manure and 3) the optimal rates of rick husks chicken manure for cassava cultivation in organic systems. These studies employed an RCB experimental design with 7 treatments and 3 replications. The treatment included a control (no organic fertilizer) and various organic fertilizer application rates as 6, 9, 12, 15, 18, and 21 times the nitrogen analysis value of the organic fertilizer. The results indicated that the cassava variety Rayong 11 was the most suitable for organic cultivation. The optimal rates of aerated compost and chicken manure with rice husk for high starch yield and high economic returns were found to be: aerated compost at a rate of 21 times the N value (2,100 kg/rai) and chicken manure with rice husk at rates of 12 times (1,200 kg/rai) the N value.
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