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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


Journal of Nuclear Agriculture & Biology 15(1): 60-66
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
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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Accession: 006300608



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