Interference of redroot pigweed (Amaranthus retroflexus L.) with soybean [Glycine max (L.) Merr.] in different fertilization systems

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Research Paper 01/12/2012
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Interference of redroot pigweed (Amaranthus retroflexus L.) with soybean [Glycine max (L.) Merr.] in different fertilization systems

Shahnaz Zarei, Mansour Sarajuoghi, Khosro Mohammadi, Mahshid Ashrafi, Majid Aghaalikhani
Int. J. Biosci.2( 12), 153-158, December 2012.
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Abstract

Information related to the density effects of redroot pigweed on soybean traits in different fertilization systems are lack. Therefore, field experiments were conducted during 2012 growing season. Experimental designs were arranged in split plots based on randomized complete block design. Main plots were consisted of six methods of fertilization including (N1): Farmyard manure (FYM); (N2): compost; (N3): chemical fertilizers; (N4): FYM + compost and (N5): FYM + compost + chemical fertilizers; and control (N6). Sub plots were there pigweed densities including (D1): 0, (D2): 10 and (D3): 20 plants m−2. Results showed that Co-application of organic and chemical fertilizers (N5) to the soil increased leaf chlorophyll significantly. The highest grain nitrogen (7.6 %) was obtained from N5D1 treatment. The highest grain P and K content was obtained from N5 treatment. The maximum of LAI was observed in N5 treatment, there is no significant difference between the organic and chemical fertilizers treatments (N1, N2 and N3). Co-application of compost, farmyard manure and chemical fertilizer produced higher amounts of pod number per plant, grain number per pod and 100-grain weight. Since the highest amounts of grain yield components were obtained from N5 and D1 treatments, N5D1 produced the highest grain yield.

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