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Growth Characters and Their Contribution to Seed and Oil Yields of Rapeseed Brassica Campestris L. in Relation to Nitrogen, Sulphur and Population Density

M. H. Ali
Department of Agronomy, BAI, Dhaka

S. M. H. Zaman
BRRI, Joydebpur, Gazipur

S. M. A. Hossain
Department of Agronomy, BAU, Mymensingh

Abstract/ Executive Summary:

Field experiments were conducted to find the effects of nitrogen. sulphur and plant density on growth attributes seed and oil yields of rapeseed Brassica campestris L. Leaf area index (LAI) leaf area duration (LAD) and crop growth rate (CGR) followed a quadratic nature of relationship with time. Maximum LAl value was recorded at 55 days which decreased with the advancement of crop age. LAD and CGR had more value during reproductive phase but RGR at vegetative phase, and gradually declined at later stages. In general, Nat 120 kg and density at 400 thousand plants/ha maintained high LAI, LAD and CGR values. The Stover, seed and oil yields Increased significantly upto 120 kg N/ha and was at per with higher rate. Density level at 400 thousand plants/ha significantly Increased the seed and oil yields. Growth parameters. stover, seed and oil yields progressively Increased with the increase of sulphur rates. CGR Increased as LAl increased and did not decrease until maximum LAI was obtained, indicating the absence of optimum LAI. Higher seed yield of 1846.00, 1670.92 and 1471.75 kg/ha were recorded with the interaction effect of 400 thousand plants along with 120 kg N and 30 kg S/ha, 400 thousand plants In combination with 120 kg N/ha, and 400 thousand plants tn addition to 30 kg/S/ha respectively

Keywords: Growth characters, Seed, Oil yields, Brassica campestris

Location: Bangladesh Agricultural Institute (BAI), Dhaka

Start Date: 00-00-1988

End Date: 00-00-1990

Program Area: Crop-Soil-Water Management

Commodity: Mustard

Objectives:

To find the effects of N, S and PO and their interactions on growth factors seed and oil yields of rapeseed

Methodology:

The experiments were carried during Rabi (winter) seasons of 1988-89 and 1989-90 at Bangladesh Agricultural Institute (BAI). Dhaka on a medium high land, located at 23.70° N and 90.40°E with humid sub tropical climate. The soil was clay loam. having pH 5.5, organic carbon 0.83%, available N, P. K. and S 54, 68, 93 and 16 kg/ha respectively within a 30 em soil profile. The treatments comprised of four levels of nitrogen (N) -0, 60. 120 and 180 kg/ha, sulphur (S)- 0. 10, 20, and 30 kg/ha and plant density (D) - 100, 400. 700. and 1000 thousand plants/ha replicated three times in a split plot design. The plot size was 4.00 m x 3.90 m. The cultivar variety Sonali Sarisha ( B. compestris L.) was sown 30 em apart rows on 2nd November in two subsequent years. All plots received a based dressing of 80 kg P205 and 40 kg K20/ ha. Entire quantity of S and half amount of N were applied prior to sowing and rest half of N was top dressed at 50% flowering. Uniform plant densities of 3, 12, 21 and 30 plants / linear meter were established, which gave plant population of 10, 40, 70 and 100 plants/m2. Two irrigations were given, one at flower initiating s age (35 DAS) and the other at completion of siliquae setting (65 DAS). Total precipitation received during two subsequent seasons (November-February) were 162 and 20 mm in two instalments respectively. One hand weeding and light spading were given to the crop growth period. Aphids were controlled by spraying Ripcord 10 EC on 32 and 56 DAS. Sampling at 15 days interval was started 25 days after sowing (DAS). Growth analysis were done at various growth stages of 25, 40, 55, 70, 85 DAS and at harvest for leaf area index (LAI). leaf area duration (LAD). crop growth rate (CGR). relative growth rate (RGR) and net assimilation rate (NAR) . Five representative plants per replicate were harvested at ground level and stripped into component parts and dried in an oven at 80°C until a constant weight was obtained for total dry matter accumulation. For leaf area measurements ten leaves were randomly selected at different positions of test plants and their areas were measured with the help of leaf area meter (Model LI-3000 USA) and these were finally weighed after proper drying. The remaining leaves were oven dried and their area were computed on the basis of area to weight ratio of the same at each growth stage and was expressed as (cm 2) per square meter of the land area. From the total dry matter (TOM) accumulation and leaf area data, the different growth parameters were computed as per the procedure out lined by Radford (1967). Besides these data on seed stover and oil yields/ha were also recorded. The data were analyzed according to the standard method of analysis of variance technique for split-split plot design.

Source of Information: J. Asiat. Soc. Bangladesh, Sci. 22(1): 107-116. 1996, ISSN 1016-6947

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The seed yield was significantly influenced by the interaction effect of N x PO, S x PO and N x S x PD. Nitrogen significantly increased the seed yield. Maximum seed yield of 1670.92 kg/ha and oil yield of 683.75 kg/ha were obtained with the combination effect of 400 thousand plants and <120 kg N/ha. PO at 400 thousand plants in addition to 30 kg S/ha produced maximum seed yield of 1471.75 kg/ha. Higher seed yield of 1846.00 kg / ha was obtained with the higher order interaction of 400 thousand plants along with 120 kg N and 30 kg S/ha. However, results revealed that reproductive phase is the most crucial period for development of different growth parameters, so at this stage crop should be free from all kinds of stresses. Thus it appears that density at 400 thousand plants, N at 120 kg and S at 30 kg/ ha cumulatively promoted different growth parameters. contributed positively towards storage reproductive phase, which in turn resulted higher stover seed and oil yields of rapeseed.

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