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Effect of Growth Regulators on the Growth and Yield of Cowpea (vigna Unguiculata(l.) Walp.).

Dr. Md. Jafar Ullah
Professor
Dept. of Agronomy, Sher-e-Bangla Agricultural University, Dhaka

Abstract/ Executive Summary:

A field experiment was carried out at Sher-e-Bangla Agricultural University, Dhaka, during the rabi season of 2001-2002, with two growth regulators - Potassium naphthenate (KNap) and Naphthalene acetic acid (NAA) on cowpea cv. Bari Falon-2 under irrigated condition. Three concentrations of KNap (1200, 1300 and 1400 ppm) and two concentrations of NAA (40 and 50 ppm) along with control were tested. Results showed that the highest plant height was obtained when NAA was applied at the concentration of 50 ppm (91.57 cm). Irrespective of treatment, dry matter (DM) increased progressively up to 105 DAS. The treatments 1300 ppm of KNap, 50 ppm of NAA and the combination of 1200 ppm of KNap with 30 ppm of NAA were at par and showed significant higher dry matter, yield attributes and yield. The highest values of dry matter/plant (60.85 g), pod length (14.25 cm), number of pods/plant (13.03), number of seeds/pod (10.96), 1000 seed weight (125 g), seed yield/plant (17.85 g), seed yield/ha (1820 kg) and harvest index (37.90 %) were obtained with KNap 1300 ppm.

Keywords: Cowpea, Vignaunguiculata, Height, Dry matter, Yield attributes

Location: Sher-e-Bangla Agricultural University Research System (SAURES), Sher-e-Bangla Agricultural University, Dhaka

Start Date: 00-00-2001

End Date: 00-00-2002

Program Area: Crop-Soil-Water Management

Commodity: Pea

Objectives:

To evaluate the effects ofPotassium naphthenate (KNap) and NAA on the growth and yield of cowpea.

Methodology:

The study was carried out at Sher-e-Bangla Agricultural University Farm, Dhaka 1207 during the rabi season of 2001-2002. BARI Falon-2 was used as test crop under irrigated conditions. Two growth regulators - potassium naphthenate (KNap) with three concentrations viz. 1200(T₁), 1300(T₂) and 1400(T₃) ppm and naphthaline acetic acid (NAA) with two concentrations viz. 40(T₄) and 50(T₅) ppm; and six combinations of KNap1200-1400 ppm with NAA30-40 ppm, namely, KNap1200NAA30 (T₆), KNap1200NAA40 (T₇), KNap1300NAA30 (T₈), KNap1300NAA40 (T₉), KNap1400NAA30 (T₁₀) and KNap1400NAA40 (T₁₁) along with control (T₀) were used. The experiment was laid out in a randomized complete block design with three replications. The unit plot size was 5m X 4m. The land was opened by a disc plough and finally prepared by three subsequent ploughing with a country plough. At the final land preparation, nitrogen, phosphorus, potassium, boron, sulfur and zinc at the rate of 20 kg N, 50 kg P₂O₅, 40 kg K₂O, 0.60 kg B, 18.0 kg S and 2 kg Zn/ha were applied in the form of urea, triple super phosphate, muriate of potash, borax, gypsum and zinc sulfate respectively.

Seeds were sown on November 15 maintaining row to row distance and plant to plant distance 50 and 20 cm respectively. The depth of sowing was 2-3 cm. Growth regulators as per treatments were sprayed on the aerial parts of the plants at 45 days after sowing (DAS). Data on plant height and total dry matter were taken from the ten plants which were selected randomly from each plot at 60, 75, 90 and 105 DAS which were the stages of onset of branching, onset of flowering, pod formation and maturity respectively. Data on pod length was taken at 75, 90 and 105 DAS. At harvest - number of pods/plant, number of seeds/pod and 1000 seed weight were collected. Data on yield/ha and harvest index were taken from the samples, which were harvested at maturity from the pre-demarcated area at the middle of each plot. Data were statistically analyzed and means were compared by LSD at 5 per cent level of significance.

Source of Information: Journal of Sher-e-Bangla Agricultural University,Vol.1 No.1, July 2007, pp. 8-13, Sher-e-Bangla Agricultural University, Dhaka

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Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The highest plant height was obtained when NAA was applied at the concentration of 50 ppm (91.57 cm). Irrespective of treatment, dry matter (DM) increased progressively up to 105 DAS. The treatments 1300 ppm of KNap, 50 ppm of NAA and the combination of 1200 ppm of KNap with 30 ppm of NAA were at par and showed significant higher dry matter, yield attributes and yield. The highest values of dry matter/plant (60.85 g), pod length (14.25 cm), number of pods/plant (13.03), number of seeds/pod (10.96), 1000 seed weight (125 g), seed yield/plant (17.85 g), seed yield/ha (1820 kg) and harvest index (37.90 %)were obtained with KNap1300 ppm.

Knowledge Management: Journal