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Effect of Nutrient Management on Population Growth of Brown Planthopper, Nilaparvata Lugens (stål)

M M Rashid
Senior Scientific Officer
Plant Physiology Division, Bangladesh Rice Research Institute, Gazipur 1701

M Jahan
Professor
Department of Entomology, Bangladesh Agricultural University, Mymensingh 5022.

K S Islam
Professor
Department of Entomology, Bangladesh Agricultural University, Mymensingh 5022.

M N Bari
Senior Scientific Officer
Entomology Division, Bangladesh Rice Research Institute, Gazipur 1701

S S Haque
Principal Scientific Officer
Entomology Division, Bangladesh Rice Research Institute, Gazipur 1701.

Abstract/ Executive Summary:

While high potassium application decreased population build up and dry weight of BPH. Brown planthopper (BPH), Nilaparvata lugens (Stål) is a major insect pest of rice in Bangladesh. Nutrient management in rice received little attention on BPH population. The present study evaluated the consequences of nitrogen (N), phosphorus (P) and potassium (K) application on population build up and weight of BPH in the laboratory and net-house at Entomology Division, Bangladesh Rice Research Institute. Three levels of soil nitrogen (0, 100, 200 kg N ha^-1), phosphorus (0, 20, 40 kg P₂O₅ ha^-1) and potassium (0, 60, 120 kg K₂O ha^-1) were compared for individual and combined effects. Interactions of N, P and K demonstrated no significant effect on population growth and weight of BPH. However, interaction of N and P showed significant effect on population growth of BPH. Fertilization with nitrogen increased population and dry weight of BPH. Phosphorus fertilization markedly increased the population growth

Keywords: BPH, Nitrogen, Phosphorus, Potassium , Population growth, Weight

Location: Bangladesh Rice Research Institute

Start Date:

End Date:

Program Area: Pest Management

Commodity: Insects

Objectives:

To investigate the influence of plant nutrient levels on population build up and weight of BPH

Methodology:

Soil was fertilized with 3 levels of nitrogen subsidy (0, 100, 200 kg N ha-¹), 3 levels of phosphorous (0, 20, 40 kg P₂O₅ ha^-1) and 3 levels of potassium (0, 60, 120 kg K₂O ha^-1) and combination of all the levels. The potted plants of different fertilizer doses were prepared separately for the experiments. Half of the N fertilizer (in the form of Urea) and the whole of P (in the form of Triple super phosphate, TSP) and K (in the form of Muriate of Potash, MP) were mixed in the soil. The remaining half of N was applied when the plants were 30-day- old. The macronutrient treatments are here after referred to as N₀, N₁₀₀ and N₂₀₀ for nitrogen, P₀, P₂0 and P₄₀for phosphorus and K₀, K₆₀ and K₁₂₀ for potassium. Fifteen-day-old rice seedlings of variety BR3 were transplanted (3 hills/pot and 2 seedlings/ hill) in each earthen pot. Plants with different fertilizer doses were labeled and placed under natural condition. As, one hectare cultivated field contains 2x106 kg soil in its root zone. So, the exact amount of fertilizers inputs to be applied to each pot was calculated based on the amount of soil in each pot . Forty five to sixty-day-old potted rice plants were used for this purpose. Gravid BPH adults were released in a cage with the rice plants for oviposition and those removed 24 hours later using by an aspirator (a mouth sucking device). The potted plants with BPH eggs were then shifted every day to a series of rearing cages for hatching of the eggs to ensure supply of same aged BPH.At 25 days after release of the adult all insects were collected in flasks containing ethyl acetone and counted. Fresh weight of twenty female adult BPH was measured to get mean fresh body weight and then all of the BPH were dried in the oven at 60 ^oC for 48 hours until constant weight and recorded total dry weight of BPH. Factorial (3x3x3) pot experiments were laid out in Completely Randomized Design (CRD) with 27 treatment combinations and four replications.The data of number and dry weight of BPH was transformed into Square-Root transformation and those were analyzed using MSTAT-C programme. The mean differences among the treatments were compared by multiple comparison tests using Duncan’s Multiple Range Test (DMRT) at 5% level.

Source of Information: Bangladesh Rice J. 17(1&2): 42-52, 2013

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Interactions of N, P and K demonstrated no significant effect on population growth and weight of BPH. However, interaction of N and P showed significant effect on population growth of BPH. Fertilization with nitrogen increased population and dry weight of BPH. Phosphorus fertilization markedly increased the population growth.

Knowledge Management: Journal