Yield of wheat, cotton, berseem and soybean under different crop sequences and fertility regimes. | [Asian Journal of Plant Sciences • 2007]

Author(s):

1. A. M. Kumbhar: Sindh Agriculture University, Tandojam, Sindh, Pakistan

2. U. A. Buriro: Sindh Agriculture University, Tandojam, Sindh, Pakistan

3. M. B. Kumbhar: Sindh Agriculture University, Tandojam, Sindh, Pakistan

4. F. C. Oad: Sindh Agriculture University, Tandojam, Sindh, Pakistan

5. G. H. Jamro: Sindh Agriculture University, Tandojam, Sindh, Pakistan

6. Q. I. Chachar: Sindh Agriculture University, Tandojam, Sindh, Pakistan

Abstract:

The series of field experiments were laid out during 1989-1990 and 1990-1991 at Students Farm, Sindh Agriculture University Tandojam, Pakistan. The crop sequences were: C1= wheat-soybean-wheat and C2= cotton-berseem-cotton. The fertilizer levels for cotton and wheat were: 50-50, 100-50 and 150-50 NP kg ha-1 and for legumes: 0-50, 25-50 and 50-50 NP kg ha-1. The general observation in the experiments showed that increasing rate of N fertilizer application significantly enhanced grain yield in all sequences and years. In wheat-soybean-wheat sequence, the maximum wheat grain yield (3198.19 kg ha-1) was obtained when crop was fertilized with 150-50 kg NP ha-1. The difference in grain yield between the two year was negligible and might be due to climatic conditions, however, maximum wheat grain yield (2645.63 kg ha-1) was obtained during 1989-90 and 2522.33 kg ha-1 grain yield was obtained during 1990-91 with the application of 150-50 kg NP ha-1. In wheat-soybean-wheat sequence it was noted that wheat planted after soybean produced highest grain yield compared to wheat grown before soybean. In cotton-berseem-cotton sequence, the fertilizer dose of 150-50 kg NP ha-1 was found superior for maximum (2538.235 kg ha-1) seed cotton yield. The cotton planted in 1989-90 produced satisfactory seed cotton yield of 2237 kg ha-1 compared to 1990-91 planted cotton. Yearly observation for fertility regimes showed non-significant differences in the seed cotton yield values. Cotton planted after berseem exhibited higher (2185.42 kg ha-1) seed cotton yield compared to cotton planted before berseem (1836.33 kg ha-1). Berseem in the crop sequence with cotton recorded maximum green fodder yield of 16065.50 kg ha-1 in the plots fertilized with 50-50 kg NP ha-1. Soybean used in crop sequence recorded maximum seed yield (1536 kg ha-1) under 50-50 kg NP ha-1. In the two year study, it was concluded that increased crop productivity could be obtained by incorporation of leguminous crop at least once in a cropping sequence, because legume crops enrich soil fertility by fixing free environmental nitrogen in their root nodules, which in turn supply residual food nutrients in the succeeding crop. It is recommended that both wheat-soybean-wheat and cotton-berseem-cotton sequences with the incorporation of 150-50 NP kg ha-1 seems to be beneficial for achieving satisfactory target yields.

Page(s): 143-147

DOI: DOI not available

Published: Journal: Asian Journal of Plant Sciences, Volume: 6, Issue: 1, Year: 2007

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