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In both mother and baby trials, cassava starch yield of treatment # 5 (medium rate) is highest in compared with control 2 as farmer practice with values are 6.99 and 6.8 tons per ha, respectively. The NRoI of treatment # 3 as “300 kg NPK Lam Thao 12:5:10” is highest at value of 7.47, means that for every 100,000 VND invested in fertilizer, the farmer will receive 747,000 VND in increased yield (profit). The treatment # 2, a farmer practice (control 2) as “300 kg per ha of NPK Lam Thao 5:10:3” have highest NRoI of 5.41 and 5.34, indicating the reason why local farmers there used to apply that fertilizer rate. Balanced application with medium rate as “300 kg NPK (5:10:5) + 147 kg Urea+ 158 kg KCL” gained highest root yield, and application of “300 kg NPK Lam Thao 12:5:10” could gain highest NRoI, are considered as CSA technologies on soil fertility management for cassava production. Therefore, we would like to recommend the farmers applying this NPK compost forcassava production.

Cassava Soil Fertility Management Technology at Yen Binh District Yen Bai Province, Vietnam