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Effects of Different Fertilizers and Combinations on the Abundance of Rice Grass Hopper in the Field

F. A. Ta lukdar
Department of Entomology Bangladesh Agricultural University, Mymensingh.

M. Shah jahan
Department of Entomology Bangladesh Agricultural University, Mymensingh.

F. A. Ta M. Hasan
Department of Entomology Bangladesh Agricultural University, Mymensingh.

S. Ahmed
Department of Entomology Bangladesh Agricultural University, Mymensingh.

Abstract/ Executive Summary:

The rice grasshopper.Oxya sp. ( Or thoptera : Acrididae ) is an important rice pests throughout the rice growing countries in Asia. In Bangladesh, it has already been recognized as an important pest cf rice of major status ( Alam. 1983; BRRI, 1985 ). Grasshopper damages at all stages of rice plant growth. Adults and nymphs feed on rice leaves from the margins of leaf blades, creating cutout areas, thereby decreasing leaf areas and finally affecting the total yield. The present research work was under taken with different types of fertilizers and fertilizer combinations to determine the effect of different fertilizers on the abundance of this pest in BR 11 rice variety. The experimental results of these trials will be helpful in taking appropriate control measures against this insect pest.

Keywords: Grasshopper, Zinc, Nitrogen, Fertilizer combinations

Location: Bangladesh Agricultural University, Mymensingh.

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

To determine the effect of different fertilizer on the abundance of this pest in BR 11 rice variety.

Methodology:

Four different field experiments on BR 11 rice variety with three different fertilizers and ten different combinations were conducted at the experimental field of Bangladesh Agricultural Univer sity, Mymensingh during the aman sea son under normal agronomic practices. The unit plot size was 4.0m x 2.5m. There were four different treatments for zinc (Zn 0 , Zn5, Zn 10 and Zn₂0) and silicon (Si0 , Si10• Si,0 and Si60). six for nitrogen (N0 , N60, N100 Nuo• N200 and N₂50) and ten for fertilizer combinations (N, NP, NK, NZn, NFym, NS, NPKK, NSZn, NPKSZn and Control) and all of them were replicated thrice in randomized block design. In case of combinations, Nitrogen (N). Phosphorus (P), Potassium (K), Sulphur (S}, zinc (Zn) and Farmyard manure (Fym) were used in a single dose i. e. N =88.0 Kg/ ha, P=68.0 Kg/ha, K=36.0 Kg/ha Zn =5.0 Kg I ha, S =30.5 Kg/ha andFym=14.5 ton/ha. Sampling of grass hopper was done with the help of a sweeping net having a diameter of 30 em. Ten sweeps were made on the top and basal portion of the rice plants by walking diagonally across the field. The sweeps were randomly taken at two different dates. first one at 35 days after transplantation (35 DAT) and the second at 50 days after transplantation OAT). The collected insects were counted properly and data of two different days were mixed. Statistical analysis was carried out using F-test and Dun can's Multiple Range Test (DMRT).

Source of Information: Bangladesh J. Agril. Sci. 20 (1) : 185- 187, January, 1993 ISSN 0379-4296

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Analysis of variance related to grass hopper population revealed that in case of zinc. lowest insignificant grasshopper population was observed in highest dose ( 20 kg/ha ), whereas the highest population was observed in lowest rate of (Znr) treatment due variable doses of different fertilizer elements & combination . In case of silicon a remarkable. but statistically insignificant effect on grasshopper population was observed, where lowest population was in Si₆₀dose . A reverse effect was observed in case of nitrogen. With the increase of nitrogen dose, the pest population showed an increasing trend . Lowest population was observed in N₀ dose. In case of fertilizer combination highest significant pest population was observed in Nitrogen and Zinc (NZn)combination (15.67) and plot treated with Nitrogen and Sulfur (NS) showed the lowest grasshopper population ( 5.16 ) followed by NPK combination (5.17). It is evident from the experimental results that there were no significant effects of different fertilizer doses but fertilizer combinations produced significant effects on the abundance of grasshopper. NS combinations showed the highest effect on grasshopper population, therefore, they may be used for lowering the incidence of rice grasshopper in rice field.

Knowledge Management: Journal