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Effect of Phosphorus Rate on Growth, Nodulation and Biomass Yield of Green Manure Crops

M. Y. A. Pramanik
Department of Agriculture Extension, Khamarbari, Dhaka, Bangladesh

M. A. R. Sarkar
Department of Agronomy, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

M. S. Uddin
Department of Agriculture Extension, Khamarbari, Dhaka, Bangladesh

G. M. Faruk
Department of Agriculture Extension, Khamarbari, Dhaka,

Abstract/ Executive Summary:

The effect of phosphorus rate on plant height, biomass yield and nodulation of green manure crops was investigated. Seven green manure species viz. Sesbania rostrata, Sesbania aculeata, Crotalaria juncea, Vigna unguiculata, Phaseolus mungo, Vigna radiata and Glycine max and three phosphorus rates viz. 18, 27 and 36 kg P ha^-1 were used. Plant height was different for each green manure crops during the growth period though phosphorus fertilization had no significant effect on plant height and biomass yield. On the other hand, phosphorus fertilization had significant effect on nodulation of green manure crops. The number of nodules plant^-1 increased significantly with the age of the plants up to 60 days after sowing (DAS) and thereafter declined sharply at 75 DAS. The highest number of nodules plant^-1was produced at 36 kg P ha^-1 followed by 27 kg P ha^-1. The lowest number of nodules plant^-1 was produced at 18 kg P ha^-1.

Keywords: Green manure crops, Phosphorus, Growth, Nodulation, Biomass yield

Location: Agronomy Field Laboratory of Bangladesh Agricultural University, Mymensingh

Start Date: 05-04-2004

End Date: 00-06-2004

Program Area: Crop-Soil-Water Management

Commodity: Bio fertilizer

Objectives:

1. To study the effect of Phosphorus rate on growth, nodulation and biomass yield of some green manure crops.

Methodology:

The experiment was conducted at the Agronomy Field Laboratory of Bangladesh Agricultural University, Mymensingh to investigate the effect of phosphorus rate on plant height, biomass yield and nodulation of green manure crops. The experiment consisted of seven green manure species viz. Sesbania rostrata, Sesbania aculeata, Crotalaria juncea, Vigna unguiculata, Phaseolus mungo, Vigna radiata and Glycine max and three phosphorus rates viz. 18, 27 and 36 kg P ha^-1. The experiment was laid out in a randomized complete block design with three replications. The unit plot size was 4.0m × 2.5m. The land was prepared by a power-tiller with several ploughings and cross ploughings followed by laddering to level the land. Weeds and other plant residues were collected and removed from the field. At final land preparation phosphorus at 18, 27 and 36 kg ha^–1 were applied in the form of triple super phosphate as per treatment specification. Seeds of green manure species were sown on 5 April 2004 in all unit plots. Five plants were randomly selected in each plot for each destructive sampling to record the data on plant height, fresh biomass and number of nodules plant^-1 at 15 day intervals beginning from 30 days after sowing (DAS) up to 75 DAS. Collected fresh samples were oven dried in an electrical oven at 650C for 72 hours to record the dry biomass yield. Central five square metres area in each plot was harvested to record the fresh biomass yield plot^-1, which was converted to ton ha^-1. The recorded data were compiled and tabulated for statistical analysis. Analysis of variance was done with the help of the computer package M-STAT. Means were adjudged by Duncan's Multiple Range Test.

Source of Information: J. Bangladesh Agril. Univ. 7(1): 23–28, 2009; ISSN 1810-3030

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

It can be concluded that among the seven green manure crops, Sesbania rostrata exhibited the highest growth performance in terms of plant height and fresh biomass yield followed in order by Sesbania aculeata and Crotalaria juncea. Vegetative growth of green manure crops were similar at different rates of phophorus. Root nodulation was the highest in Sesbania aculeata. Fertilization with P at 36 kg ha ^-1 maximized nodulation in green manure crops.

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