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EFFECT OF APPLIED PHOSPHORUS AND ZINC ON THEIR ABSORPTION AND DISTRIBUTION IN CHICKPEA PLANT

We conducted experiments to study the effect of applied phosphorus and zinc on their absorption and distribution in chickpea plants grown up to 64 days in a loamy sand (Typic Torripsamments). In the first experiment treatments included four levels of tagged P (25, 50, 100, and 250 ppm) at 0.25 mCi/g P2O5, and in the second experiment they included 5 ppm of tagged Zn at 0.1 mCi/g Zn and five levels of P (0, 25, 50, 100, and 250 ppm) in all possible combinations. During 64 days of growth, 4.9 to 11.4 and 0.64 to 1.50 percent of fertilizer P and Zn were utilized by four chickpea plants, respectively. The absorption of fertilizer P was generally more than soil P and more with Zn than without Zn. About 75 percent of absorbed P was translocated to shoots with P up to 550 ppm, whereas at higher P levels, more P was retained in roots. Translocation of soil P to shoots decreased with 100 and 250 ppm P. Utilization and translocation of both soil and fertilizer Zn were considerably increased by 25 ppm P. At 250 ppm P, the utilization of soil and fertilizer Zn was decreased. The results showed that applied P and Zn affected absorption and distribution of soil and fertilizer P and Zn in roots and shoots, depending upon their level. These results also confirmed the occurrence of P and Zn interactions both in soil and in different plant parts, and the nature of these interactions may depend upon the soil pH and their levels.