Abstract
A field experiment was conducted for integrated nutrient management in a recently reclaimed soil. For this purpose a saline sodic field was selected at soil salinity research farm having ECe , 7.40 (dS m-1); pHs , 8.90; SAR, 38.26 (mmol L-1) ½ and gypsum requirement, 3.52 (ton acre-1); deficient in total nitrogen (0.017%) and available phosphorus (4.20 mg kg-1) and medium in extractable K (90 mg kg-1). This field was reclaimed by applying gypsum at 100% G.R. After reclamation, different combinations of FYM, Sesbania and chemical fertilizers were applied. The experiment was layed out in randomized complete block design with three replications. Rice variety Shaheen basmati was transplanted. The data showed that different combinations of organic manures with chemical fertilizers increased paddy and straw yield significantly over application of organic manures alone. Among different combinations, Sesbania at 20 ton ha-1 + 75% recommended dose (R.D.) proved to be the best combination followed by Sesbania 20 ton ha-1 + 50% R.D. and least in FYM alone at 20 ton ha-1. It was also noted that sesbania green manuring alone was found superior to FYM alone. The NPK contents both in paddy and straw were increased significantly by applying various combinations of organic manures with chemical fertilizers over application of organic manures. Maximum contents of NPK both in paddy and straw of rice were recorded in the combination of Sesbania at 20 ton ha-1 + 75% R.D. followed by Sesbania 20 ton ha-1 + 50% R.D. and least in FYM alone at 20 ton ha-1.The soil analysis after harvest of rice showed that it was still slightly sodic in nature but free from salinity, deficient in total N and available P but adequate in extractable K. After harvest of rice crop in the same layout wheat variety Inqulab 91 was sown. Percent recommended dose of NPK was applied to all the plots as per treatment plan to see the residual effect of the organic manures applied to rice crop. Crop was harvested at maturity. The results of grain and straw yield showed that different combinations of organic manures (residual) and chemical fertilizers increased grain and straw yield significantly over alone application of organic manures (residual). Recommended dose of chemical fertilizers alone applied to wheat gave the maximum yield of grain and straw followed by combinations of FYM at 20 ton ha-1 + 75% R.D (residual) which was non significant with FYM 20 ton ha-1 + 50% R.D (residual) combination and least in FYM and Sesbania alone at 20 ton ha-1 (residual). The NPK contents both in grain and straw were increased significantly by applying various combinations of organic manures (residual) and chemical fertilizers over alone application of organic manures (residual). Maximum contents of NPK both in grain and straw of wheat were recorded in the combination of seabania at 20 ton ha-1 (residual) + 75% R.D. followed by Sesbania at 20 ton ha-1 + 50% R.D. and least in alone Sesbania and FYM (residual) treatments. Soil analysis after harvest of wheat showed that salinity/ sodicity parameters of the soil decreased, while fertility status of the soil improved further.

Shahzada Munawar Mehdi1, , Muhammad Sarfraz1, Ghulam Shabbir1 , Jalil Akhtar1, Syed Touqueer Abbas2. (2o11) Integrated nutrient management for rice-wheat cropping system in a recently reclaimed soil, The Journal Soil & Environment , Volume 30, Issue 1.
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