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Effect of Phosphorus Fertilizer on Yield and Nutritional Value of Sorghum (sorghum Bicolor) Fodder at Three Cuttings

P. R. S. Roy
Department of Animal Nutrition, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh.

Z. H. Khandaker1
Department of Animal Nutrition, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh.

Abstract/ Executive Summary:

An experiment was conducted to evaluate the effect of various levels of phosphorus fertilizer on the yield and nutritional value of sorghum fodder at three cuttings. The experiment was conducted by using 4 levels of Phosphorus fertilizer viz. 0 (T₀) 40 (T₁), 80 (T₂) and 120 (T₃) kg TSP/ha in a Completely Randomized Design (CRD). A significant effect (P<0.01) of phosphorus fertilizer application on plant height was observed with 80 kg TSP/ha at 60 days in 1^stcutting and at 15 and 30 days in 2nd and 3rd cuttings. Highest green fodder was observed at 40 kg TSP/ha in 1st cutting but the effect was non significant. A significant effect (P<0.01) in green matter yield was observed at 80 kg TSP/ha in 2nd and 3^rd cuttings. On the other hand, a significant effect (P<0.01) was observed on DM yield in first and second cuttings. Application of phosphorus fertilizer had a significant effect (P<0.01) on DM content in second cutting but non significant effect in 1st and 3rd cuttings with 80 kg TSP/ha. In 1^st and 3^rd cuttings, a significant difference on CP content was observed but in 2^nd cutting the difference was non significant. CF, EE and P content were increased significantly in three cuttings. Highest phosphorus content was observed at 120 kg TSP/ha in each cutting. A significant effect (P<0.01) was observed on Ash content in 3rd cutting but the effect was non significant in 1st and 3rd cuttings. In 2^nd cutting, IVOMD content of sorghum fodder was statistically significant but in 1^st and 3^rd cuttings the effect was non significant with 120 kg TSP/ha. A significant effect (P<0.01) was observed on ME content of fodder in 2^nd and 3^rd cuttings but the effect was non significant in 1^st cutting at 120 kg TSP/ha. Based on the above findings, it may be suggested that sorghum fodder can be cultivated through the application of 80 kg TSP/ha and harvested at the age of 66 days at first cutting for maximum production.

Keywords: Phosphorus, Sorghum fodder, Cuttings, Chemical composition, Metabolizable energy

Location: Shahjalal Animal Nutrition Field Laboratory of Bangladesh Agricultural University, Mymensingh

Start Date: 01-04-2009

End Date: 30-09-2009

Program Area: Crop-Soil-Water Management

Commodity: Sorghum

Objectives:

To assess the yield and quality attributes of Sorghum fodder as influenced by different levels of TSP as a source of phosphorus fertilizer at three cuttings.

Methodology:

The experiment was carried out in the Shahjalal Animal Nutrition Field Laboratory of Bangladesh Agricultural University, Mymensingh during the period from April 2009 to September 2009. The texture of the soil was slity loam and neutral in nature. The experiment was conducted by using 4 levels of Phosphorus fertilizer viz. 0 (T0), 40 (T1), 80 (T2) and 120 (T3) kg TSP/ha in a Completely Randomized Design (CRD). Basal doses of urea and murate of potash (MP) were applied at the rate of 50 and 30 kg/ha respectively. During land preparation, the required amount of TSP (as per treatment), MP and one-half of the recommended amount of urea (25 kg/ha) were applied and rest one-half of the urea (25 kg/ha) was applied 5 weeks later as top dressing. Subsequently after 15 days after each cutting, the urea was applied at the rate of 50 kg/ha as top dressing. The seeds were sown by line sowing method at the rate of 50 kg/ha after completion of land preparation and fertilizer application. Plant height was measured every fortnightly. Green sorghum fodder in each plots were harvested on 66th day after sowing (1st cutting) and then 40th day after yield was recorded in order to know the total green forage yield and representative samples of sorghum fodder was collected from each experimental plot. The samples were dried in the sun and ground through 40 mm mesh sieve and kept in polythene bags for further analysis. The nutrient contents of sorghum fodder in different cuttings were determined according to the methods of AOAC (2003). Phosphorus concentration of the samples was determined following the method of Page et al. (1982). The IVOMD and ME content of sorghum fodder was determined following the procedure of Menke et al. (1979) and the calculation was done according to Menke and Steingess (1988).irst and second cuttings, i.e. 2nd and 3rd cuttings respectively. During each cutting green biomass.

Source of Information: Bang. J. Anim. Sci. 2010, 39(1&2) : 83 – 88 ISSN 0003-3588

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

A significant effect (P<0.01) of phosphorus fertilizer application on plant height was observed with 80 kg TSP/ha at 60 days in 1^stcutting and at 15 and 30 days in 2^nd and 3^rd cuttings. Highest green fodder was observed at 40 kg TSP/ha in 1st cutting but the effect was non significant. A significant effect (P<0.01) in green matter yield was observed at 80 kg TSP/ha in 2^nd and 3^rd cuttings. On the other hand, a significant effect (P<0.01) was observed on DM yield in first and second cuttings. Application of phosphorus fertilizer had a significant effect (P<0.01) on DM content in second cutting but non significant effect in 1st and 3rd cuttings with 80 kg TSP/ha. In 1^st and 3^rd cuttings, a significant difference on CP content was observed but in 2^nd cutting the difference was non significant. CF, EE and P content were increased significantly in three cuttings. Highest phosphorus content was observed at 120 kg TSP/ha in each cutting. A significant effect (P<0.01) was observed on Ash content in 3^rdcutting but the effect was non significant in 1^st and 3^rd cuttings. In 2^nd cutting, IVOMD content of sorghum fodder was statistically significant but in 1^st and 3^rd cuttings the effect was non significant with 120 kg TSP/ha. A significant effect (P<0.01) was observed on ME content of fodder in 2^nd and 3^rd cuttings but the effect was non significant in 1^st cutting at 120 kg TSP/ha. Based on the above findings, it may be suggested that sorghum fodder can be cultivated through the application of 80 kg TSP/ha and harvested at the age of 66 days at first cutting for maximum production.

Knowledge Management: Journal