Impact Of Different Time Planting In Soybeans And Neem Seed Extract Application To Insect Population On Rice Field

Abstract: The purpose of research is to study impact of different time planting of soybean and neem seed extract application to pest insect population on rice field. The research was used Random Block Design in three treatment of insecticides application i.e: neem seed extract together with rice planting, neem seed extract on soybean 17 days after rice planting, synthetic insecticides on 17 days after rice planting (Delthametrin on soybean and Chlorpirifos on rice), respectively. Research was conducted in rice fields with irrigation channels. The land area is 0.8 hectares with extensive experiments each rice terraces approximately 900 m2 with separate by rice terraces for every treatment. Each treatment consisted of three groups and using nine rice terraces. Samples of the rice plant population is 25 plants per sample unit. The results was showed treatment by neem seed extract with different time planting of soybeans able to reduce number of pest insects populations such as : N. virescens (80.38%) , N. lugens (67.17%), S. incertulas (66.5 %), and L. oratorius (93.46%) when compared to treatment with synthetic insecticides (Delthamethrin and Chlorpyrifos).

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