Effects of nitrogen and potassium on growth, yield and soluble carbohydrate content of cassava [Manihot esculenta, at Khon Kaen Univ., Khon Kaen, Thailand]
1985
Chairoj Wongwiwatchai
The results up to 9 months of cassava showed that both N and K fertilizers affectingd top growth dry weight. K fertilizer induced root yield while N fertilizer had no effect. Root dry weights were related to total dry weight, top dry weight and slightly related to net assimilation rate (E) and leaf area duration (D). Plant tissue analysis showed that N content in leaf increased with increase in N level and so with the K level. The tissue N content in root decreased with increase in K level while N level increased tissue N content. The tissue K content in leaf and root increased with increase in both N and K levels. The soluble carbohydrate content in root increased slightly with increase in K level but decreased with increase in N level. Growth and development of cassava after 9 months stage was affected by leaf spot disease (Cercospora sp.) with greater damage to the fertilized plot. The results after 9 months of age showed that top growth was affected by N while K was slightly affecting both root dry weight and top growth dry weight
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