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Dry Matter Accumulation and Partitioning in Chickpea (cicer Arietinum L.) as Affected by Nitrogen Levels and Knap Concentrations

MD. FAZLUL KARIM
Department of Agronomy, Sher-e-Bangla Agricultural University, Sher-e-Bangla Nagar, Dhaka 1207, Bangladesh

QUAZI ABDUL FATTAH
Department of Botany, University of Dhaka, Dhaka-1000, Bangladesh.

Abstract/ Executive Summary:

Accumulation of dry matter in above ground parts of chickpea (Cicer arieti num L. cv. Barichhola-5) plant and its partitioning were studied under three nitrogen levels (0, 20 , 40 kg/ha) and five KNap concentrations (0, 500, 1000 , 1500, 2000 ppm) during rabi season of 1998-99. Results revealed that, irrespective of treatment variations, dry matter accumulation in stems and leaves started slowly at early growth stage (45 DAS). Out of total above ground dry matter accumulation, stems accounted for up to 39, 38 and 26 % and leaves accounted for up to 66, 46 and 20% during vegetative, grain filling and harvest stages of crop, respectively due to the combined effect of 20 kg N/ha and 1500 ppm KNap. At harvest stage pod contributed up to 62% of above ground dry matter with the same treatment combination. Higher contents of above ground dry matter and the economic partitioning of dry matter in the chickpea plant parts ultimately elevated harvest index values.

Keywords: Chickpea, Nitrogen, KNap, Dry matter, Accumulation, Partitioning

Location: Farm of the present Sher-e-Bangla Agricultural University, Sher-e Bangla Nagar, Dhaka, Bangladesh.

Start Date: 00-00-1998

End Date: 00-00-1999

Program Area: Crop-Soil-Water Management

Commodity: Chickpea

Objectives:

To study the effects of fertilizers and KNap on the production of dry matter, it's partitioning to the plant parts and harvest index value.

Methodology:

A field experiment was conducted during rabi season of 1998-99 on a silty loam soil of the farm of the present Sher-e-Bangla Agricultural University, Sher-e Bangla Nagar, Dhaka, Bangladesh. There were three levels of nitrogen with recommended doses of P₂0₅, K20, S and B at the rate of 40, 20, 20 and 1 kg/ha, respectively. The N levels were No = no fertilizer; N₁ = 20 kg N/ha; N₂ = 40 kg N/ha. Five levels of KNap (Potassium naphthenate) as foliar spray were Go ;water spray (control); G₁ = 500 ppm; G₂ = 1000 ppm; G₃ = 1500 ppm; G₄ = 2000 ppm. The experiment was carried out following factorial randomized complete block design with three replications. The unit plot size was 6 m x 4.4 m. Seeds of chickpea variety Barichhola-5 were sown on 19th November 1998 in rows with 40 cm distance between rows. The plants in rows were maintained 10 cm apart by thinning after 15 days of sowing (DAS) to achieve the plant density of 25 plants m². Intercultural operations were done. Fertilizers were applied during final land preparation as per treatments. KNap solutions were prepared by using naphthenic acid (HNap) and potassium hydroxide following Fattah and applied over plants at first flowering stage (45 DAS) with a spray machine. Ten plants from each treatment were sampled periodically from 45 DAS to harvest at an interval of 15 days. The destructive samplings were done for determination of leaf area index (LAI), above ground dry matter (DM), dry matter components (stems, leaves, flowers and pods) and harvest index (HI). All plant parts were dried at 80°C in an oven for 72 hours, their dry weights were recorded, and finally DM partition was calculated. Data were analyzed statistically and the means were compared by the LSD test.

Source of Information: Dhaka Univ. J. Biol. Sci. 12(2): 115-121, 2003 (July)

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

From this study it is concluded that an appropriate rate of nitrogen fertilizer (20 kg/ha) with other optimum fertilizers and 1500 ppm KNap play an important role of accumulation of above ground dry matter and its economical partition towards better grain filling leading to higher HI value in chickpea plant .

Knowledge Management: Journal