FERTILIZER RESPONSE AND YIELD PREDICTION OF UPLAND RICE UNDER HILLTRIBES CONVENTIONAL PRACTICES
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Abstract
A field investigaion was carried out in three highland locations in Chiang Mai during 1984 rainy season to study fertilizer response and yield prediction of upland rice under hill tribes conventional practices. Without fertilizer application, the results showed that rice grain yield varied considerably depending upon soil fertility status among locations. Highly correlations were found between crop yield and soil pH, phosphorus, and potassium. By using a stepwise regression, however, the analysis indicated that grain yield was fairly well estimated by soil pH and phosphorus availability. Potassium appeared to be superfluous when both pH and phosphorus were already included in the regression equation.
Though rice yield increased upon the applications of nitrogen and phosphate fertilizers, the percent increases in grain yield were widely different among the locations tested. A comparatively high yield increase was noted with the soil low in fertility. Whereas, the percent increase in high fertility soil was relatively low.
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References
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