Research Article 
Cotton Response to Mepiquat Chloride and Nitrogen under Ultra Narrow Plant Spacing
Muhammad Iqbal, Khezir Hayat and Noor-ul-Islam
Asian Journal of Plant Sciences, 2007, 6(1), 87-92.
Abstract
Mepiquat chloride (1-1-dimethyl-piperidinium chloride) as a plant growth regulator that can be used by producer to manage the crop development, uniformity and maturity. Field experiment was conducted during 2005-06 to evaluate the affect of plant spacing, Nitrogen fertilizer and mepiquat chloride application on cotton (Gossypium hirsutum L.) var. MNH789. Three plants spacing (15, 23 and 30 cm), four nitrogen fertilizer level (0, 50, 100 and 150 kg ha-1) with two rates of Mepiquat chloride (2x100, 2x200 mL ha-1 ) were evaluated for seed cotton yield and yield components. Results showed that Plant Height (PH), Monopodial branches per plant (MB), Node of first fruiting branch (NFB), sympodial branches/plant (SB), No. of bolls/plant and seed cotton yield were different among plant spacing, nitrogen fertilizer while MB, NFB, SB and total main stem nodes/plant were not differed significantly among the Pix application. Whereas MB, B. wt was not affected significantly by the plant spacing, nitrogen fertilizer and pix application. Cotton grown in narrow plant spacing (15 and 23 cm) had higher seed cotton yield (4218 and 4171 kg ha-1) at high dose of fertilizer (150 kg ha-1) with low dose of pix (2x100 mL ha-1). This combination of treatment increased the total main stem nodes, SB and bolls/plant while the internodal length decreased. From present study it is concluded that high seed cotton yield can be achieved at low plant spacing, high nitrogen fertilizer with use of pix to manage the excessive plant growth.
ASCI-ID: 7-1071
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