Field experiments conducted uver two seasons with varying levels of nitrogen and potash on tapioca varieties Indicated that tuber dry matter increased with the age of the crop but heavy rainfall at the time of harvest caused a reduction. The starch content of the tuber in both Burma and H. 165 varieties increased upto ninth month beyond which the increase was not appreciable. Variety Coimbatore local registered higher crude fibre content followed by Rurma and H. 165. Nitrogen application had significantly increased the crude fibre and HCN content of ruher Potash had no effect on crude fibre but reduced HCN content. With the maturity of the tuber, the fibre content decreased. The hybrid H. 165 registered higher. HCN content followed by Coimbatore local and Burma At the time of harvest lowest HCN content was recorded in all the three varieties,
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Tamil Nadu Agricultural University
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