Effect of sewage sludge and inorganic fertilizers on productivity and fertility of soil under cotton-wheat cropping system
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Date
2019
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CCSHAU
Abstract
A field experiment was initiated in 2016-17 at Soil Research Farm of CCS HAU, Hisar, to study the effect of sewage sludge and chemical fertilizers on yield, nutrient uptake and fertility status of soilunder cotton-wheat cropping system. The experiment was laid out in a split-plot design. During these three years, the following treatments were applied to main-plots viz. SS (Sewage sludge)@ 5 t ha-1, SS +N+50 %P, SS +N+75 %P, SS +N+100 %P, RDNP. After the harvesting of wheat, cotton crop was sown and main-plots were divided into sub-plots and then following treatments were applied viz. N+75%PK , NK+75%P , NP+75% K, NPK. The treatments were replicated thrice. Application of SS +N+100 %P x NPK level of interaction recorded highest wheat grain (5220 kg/ha) and straw yield (9906 kg/ha). The mean grain and straw yield of wheat under RDNP was statistically at par with SS + N + 75% P. The same combination SS and inorganic fertilizers recorded highest seed cotton yield (4070 kg/ha) and stover yield (5427 kg/ha). The highest NPK uptake in both crops were observed in SS +N+100 %P x NPK level of interaction viz222.57, 24.89 and 12.41 kg/ha in wheat grain 114, 15.66 and 49.71 kg/ha by cotton seed, respectively. The heavy metal content was below the permissible limits in both plant and soil. The organic carbon showed an increasing trend from its initial value viz. 0.42%. The soil available N and K decreases from its initial value while available P showed an increment. The combination of SS x N + 75% PK recoded highest micronutrient and heavy metals content in soil. The MBC of soil varied non-significantly and highest was observed in RD NP x NPK level of interaction.