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A study was conducted in the farm soils of PAJANCOA & RI, Karaikal in order to quantify the distribution of Phosphorus (P) in different pools as well as to study the response of paddy crop to P application. A pot culture experiment was carried out with four types of soils which are differing with their P status namely (i) soils with low levels of both labile and non-labile-P (ii) soils with low levels of labile-P and high levels of non-labile-P (iii) soils with high levels of labile-P and low levels of non-labile-P and (iv) soils with high levels of both labile and nonlabile-P and with four doses of P application namely 0, 50, 100 and 150 kg P2O5 haˉ1. The results indicated that the height of the plant decreased with the application of P in general. However, in soils which registered lower levels of labile and non-labile-P, the addition of P tended to increase the plant height. The number of tillers was found to be the maximum with the application of 100 kg P2O5 haˉ1, though this was significant in soils which recorded high levels of labile-P.

Changes in the Growth Parameters of Paddy in Soils with Varying Phosphorus Status and Doses of Phosphorus Applied