The study on root characteristics of cotton as influenced by varieties and levels of P at three stages of crop growth showed that the rate of root growth was slow during first 60 days, but was rapid during 60 to 90 days. Root length, root density and fresh root weight were not affected by P level. Uptake of P in shoot and root increased up to 60 days but subsequently declined with advancing age. Cultivar CJ-73 was an efficient extractor of P compared to L-147. P uptake by shoot was affected. Uptake by root was not very much affected by P levels.
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