Effect of planting geometry and fertilizer N rates on nitrate leaching, nitrogen use efficiency, and sugarcane yield
1997
Yadav, R.L. | Singh, R.V. | Singh, R. | Srivastava, V.K. (Indian Institute of Sugarcane Research, Lucknow (India))
In a field experiment conducted over two consecutive cropping seasons (1989-91 and 1990-92) at Lucknow, India, autumn sugarcane (Saccharum officinarum L. cv. Colk 8001) was fertilized with 0, 75, 150, 225, and 300 kg N ha**-1 and planted at 40,000 three-bud setts per hectare in single rows spaced at 90 cm apart (conventional planting); 80,000 three-bud setts per hectare in single rows spaced at 90 cm apart; and 80,000 three-bud setts per hectare in paired (double) rows having 30- and 60-cm spacings within and between paired (double) rows, respectively. The double-row planting technique, on an average, minimized the nitrate-N leaching from inter-row spaces, thus increasing recovery of applied N by 15.8 percent over conventional planting. Consequently, the yield response per kilogram applied N was 369 kg cane from double-row planting compared with 278 kg cane from conventional planting. With increasing losses of nitrate-N due to leaching, recovery of applied N decreased from 72.3 to 30.9 percent, respectively, when the rates of applied N increased from 75 to 300 kg ha**-1. The yield response also decreased from 443 to 224 kg cane for each kilogram of N applied between these rates.
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