caa a22 4500 386326797 CHVBK 20180307111655.0 cr unu---uuuuu 161130e198901 xx s 000 0 eng 10.1017/S0014479700016422 doi S0014479700016422 pii (NATIONALLICENCE)cambridge-10.1017/S0014479700016422 Pundarikakshudu R. Central Institute for Cotton Research, PB 125, GPO Nagpur 440 001, India Studies of the Phosphate Dynamics in a Vertisol in Relation to the Yield and Nutrient Uptake of Rainfed Cotton [Elektronische Daten] [R. Pundarikakshudu] Field studies of the dynamics of transformation and availability of applied phosphorus in a Vertisol cropped with rainfed cotton showed that phosphorus application increased available phosphorous in the soil. However, 70-80% of the phosphorus was fixed when more than 40 kg P2O5 ha−1 was applied. Maximum uptake of phosphorus by cotton occurred during the active growth period 40 to 80 days after germination, as reflected in a steep decline in the labile pool of available phosphorus in the soil. Over 50% of the total inorganic phosphorus occurred as Ca-P, which was the major contributor to the labile pool available to the cotton crop. The maximum response of cotton in terms of both dry matter and seed cotton and the maximum uptake of nitrogen, phosphorus and potash occurred when phosphorus was applied at 40 kg P2O5 ha−1. Phosphorus application increased the length, spread, volume and weight of roots. Copyright © Cambridge University Press 1989 Experimental Agriculture Cambridge University Press 25/1(1989-01), 39-45 0014-4797 25:1<39 1989 25 EAG https://doi.org/10.1017/S0014479700016422 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S0014479700016422 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Pundarikakshudu R. Central Institute for Cotton Research, PB 125, GPO Nagpur 440 001, India NATIONALLICENCE 773 0- Experimental Agriculture Cambridge University Press 25/1(1989-01), 39-45 0014-4797 25:1<39 1989 25 EAG CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge