Effect of combination fertilizer on growth and yield of Cassava cv. Rayong9 in Thailand
2025
Srifa, T. | Somwang, T. | Panitnok, K. | Yusuk, P. | Sarutayophat, T. | Nitthaisong, P.
The effects of combination fertilizer applications on cassava growth, yield, and starch content (cv. Rayong 9) were investigated. Plant heights were highest in chemical fertilizer only (T3) and combined chemical fertilizer with biofertilizer (T4) treatments. Stem diameter and SPAD chlorophyll readings were significantly higher in T4 at a key growth stage. After six months of harvesting, T4 yielded the highest fresh leaves (258.75 kg ha⁻¹) and rhizome yields (1184.75 kg ha⁻¹). T3 produced the highest fresh root yield in eight months of 15,937.50 kg ha⁻¹, while T4 outperformed all treatments at ten months (17,787.50 kg ha⁻¹). However, reducing the NPK fertilizer rate to half (12.5 kg ha⁻¹) combined with PGPR (T5) significantly enhanced cassava root yield at both the 6 and 10-month when harvested as compared to the full NPK fertilizer rate (T3, 437.5 kg ha⁻¹) only. Moreover, T5 showed the highest starch content at six months of growth (27.14%) and harvesting at ten months (19.67%). These findings indicated that integrating biofertilizers with reduced chemical fertilizer applications is a promising approach for promoting sustainable cassava production.
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