Direct and residual effects of agro-industrial wastes on a rocket salad ( <i>Eruca sativa</i> Mill.) — Sorghum [ <i>Sorghum bicolor</i> (L.) Moench] sequence
2008
Sharma, D. K. | Rana, D. S. | Kaushik, R. | Kumar, S. | Joshi, H. C.
A field study conducted for two years (2002–04) at New Delhi showed that the seed yield (1.80 t ha <sup>−1</sup>) of rocket salad (<i>Eruca sativa</i> Mill.) obtained by applying 5 t ha <sup>−1</sup> pressmud compost based on distillery effluent + half the recommended dose of NPKS (recommended dose: 60 kg N, 13 kg P, 25 kg K and 20 kg S ha <sup>−1</sup>) was on par with the seed yield (1.69 t ha <sup>−1</sup>) recorded with the recommended dose of NPKS. However, the seed yield recorded with the former treatment significantly exceeded that obtained with 5 t ha <sup>−1</sup> of a 1:1 mixture of fly ash and distillery effluent + half the recommended dose of NPKS (by 30.4%) or 5 t ha <sup>−1</sup> of dry <i>Jatropha curcas</i> leaves + ½ NPKS (by 24.1%). On average, distillery effluent-based pressmud compost + ½ NPKS induced a perceptible increase in the soil-available NPK, recorded after the harvest of rocket salad, compared to the initial fertility status. The uptake of NPKS in the seed and stover of rocket salad was the highest after the application of pressmud compost, closely followed by the recommended dose of NPKS, and the lowest in the control. The residual effect of treatments given to rocket salad was significant on the fodder yield of succeeding sorghum [ <i>Sorghum bicolor</i> (L.) Moench]. The fodder yield recorded with pressmud compost + ½ NPKS was significantly higher than the other treatments. The application of pressmud compost alone was also significantly superior to the same rate of fly ash + effluent mixture or dry <i>Jatropha</i> leaves with respect to the seed yield of rocket salad, residual fertility after the harvest of rocket salad and the fodder yield of succeeding sorghum.
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