RESPONSE OF ZINC AND IRON ON YIELD AND NUTRIENT COMPOSITION OF OKRA (Abelmoschus esculentus L. Moench)
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Date
2011-05
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jau,junagadh
Abstract
The present experiment entitled, “Response of zinc and iron on yield and nutrient composition of okra (Abelmoschus esculentus L. Moench)” was carried out during the kharif season of the year 2010 at Instructional Farm, Department of Agronomy, College of Agriculture, Junagadh Agricultural University, Junagadh. The experiment was laid out in the factorial randomized block design with four replications and nine treatment combinations, considering three levels each of zinc (0, 25 and 50 kg ZnSO4 ha-1) and iron (0, 25 and 50 kg FeSO4 ha-1).
The results of experiment indicated that, among different levels of ZnSO4 (0, 25 and 50 kg ha-1), 50 kg ZnSO4 ha-1 significantly increased plant height (88 cm), number of leaves (14) per plant, immature green fruit girth (6.09 cm), immature green fruit yield (2888 kg ha-1), dry pod yield (664 kg ha-1), stalk yield (2215 kg ha-1) and protein content (22.93 %) at harvest. Among different levels of FeSO4 (0, 25 and 50 kg ha-1), application of 50 kg FeSO4 ha-1 significantly increased number of leaves (14) per plant, immature green fruit girth (6.00 cm), immature green fruit yield (2934 kg ha-1), dry pod yield (675 kg ha-1), stalk yield (2204 kg ha-1) and protein content (23.14 %) at harvest of okra.
The application of ZnSO4 did not produced any significant effect on content of all the nutrients in stalk at all the growth stages and its content in pod except S and Zn content at 30, 60, at harvest and in pod. The significantly higher S content (0.596, 0.538, 0.327 and 0.455 %) and Zn content (133, 149, 206 and 119 mg kg-1) in stalk at 30, 60, at harvest and in pod with the soil application of 50 kg ZnSO4 ha-1, respectively.
The application of FeSO4 did not produced any significant effect on content of all the nutrients in stalk at all the growth stages and its content in pod except S and Fe content at in stalk 30, 60, at harvest and in pod. The significantly higher S content (0.585, 0.537, 0.324 and 0.455 %) and Fe content (1193, 1284, 1027 and 298 mg kg-1) in stalk at 30, 60, at harvest and in pod with the soil application of 50 kg FeSO4 ha-1, respectively.
The application of 50 kg ZnSO4 ha-1 significantly increased the uptake of P (2.05, 4.53 and 6.59 kg ha-1), S (2.18, 10.08 and 12.26 kg ha-1), Zn (137, 263 and 400 g ha-1) and Mn (35.10, 320.57 and 356 g ha-1) by pod, stalk and its total uptake by okra crop, respectively as compared to control. While significantly increased in uptake of N (15.38 and 44.3 kg ha-1), K (11.17 and 30.95 kg ha-1) and Cu (8.28 and 40 g ha-1) by pod and its total uptake, respectively and Fe (2230 and 2418 g ha-1) by stalk and its total uptake with soil application of 50 Kg ZnSO4 ha-1, respectively.
The application of 50 kg FeSO4 ha-1 significantly increased the uptake of S (2.19, 10.03 and 12.23 kg ha-1) and Fe (202, 2265 and 2466 g ha-1) by pod, stalk and its total uptake by okra crop, respectively as compared to control. While significantly increased in uptake of N (15.69 and 44.8 kg ha-1), P (2.07 and 6.55 kg ha-1), K (11.74 and 30.95 kg ha-1), Zn (135 and 388 g ha-1), Cu (8.40 and 40 g ha-1) and Mn (35.79 and 318.13 g ha-1) by pod and its total uptake with application of 50 kg FeS04 ha-1, respectively.
The effect of zinc application on soil parameter like EC, pH and OC, available soil N, P2O5 and K2O and DTPA extractable Fe, Mn and Cu content in soil were observed non-significant. While the application of ZnSO4 @ 50 kg ha-1 resulted in significantly higher Zn content (1.10 mg kg-1) and S content (18.2 mg kg-1) in soil after harvest of okra crop.
The effect of iron application on soil parameter like EC, pH and OC, available in soil N, P2O5 and K2O and DTPA extractable Zn, Mn and Cu content in soil were observed non-significant. While the application of FeSO4 @ 50 kg ha-1 resulted in significantly higher Fe content (8.43 mg kg-1) and S content (17.8 mg kg-1) in soil after harvest of okra crop.
The interaction effects of zinc and iron on yield and yield attributing characters, content and uptake of all the nutrients and on available nutrients in soil after harvest of crop found non- significant.