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Relationship of growth and phosphorus uptake by wheat triticum aestivum to quantity intensity and buffering capacity factors of phosphorus in bench mark soils of punjab india



Relationship of growth and phosphorus uptake by wheat triticum aestivum to quantity intensity and buffering capacity factors of phosphorus in bench mark soils of punjab india



Journal of Nuclear Agriculture & Biology 15(1): 60-66



Adsorption of P in ten bench mark soils of Punjab was studied using graded levels of P(32P-labelled) to define the functional relationship between quantity, intensity and buffering capacity factors of soil P and the growth and P uptake by wheat crop. A supply parameter integrating the quantity, intensity and buffering capacity factors into single unifying term was computed from the data of P adsorption. Simultaneously, a greenhouse experiment was also coducted on wheat (Triticum aestivum L. var; WL 1562) on ten soils to determine the value of supply parameter for sustaining the supply of P for optimum growth and uptake in wheat. Near maximum dry matter production was achieved when P supply parameter assumed a value of 1.06, 1.3, 0.5, 0.5 and 1.2 in Balluana, Bhogpur, Habowal, Kanjli and Ladhowal soils of Group I (calcareous soils). However, the values of supply parameter were approximately 2.6 in Fatehpur, 0.7 in Gulpur, 0.4 in Gurdaspur, 0.78 in Jalalabad and 0.16 in Randhawa series of non-calcareous soils (Group II) for attaining near maximum dry matter yield. A highly significant relationship was found between P supply parameter and total P removal by wheat in soils of both the groups. Variations in P uptake by wheat to the tune of 81 to 82 per cent in calcareous (Group I) and 86 per cent in non-calcareous (Group II) soils could be accounted for with the use of P supply parameter. Supply parameter and cumulative P desorbed were also significantly related. Supply parameter proved to be a better predictor of P supply than quantity, intensity or buffering capacity individually.

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