Author(s):

Ajita Soren and Rabindra Prasad

Abstract: Rice (Oryza sativa L.), is the most important crop of Jharkhand. Ear bug (Leptocorisa acuta Thunberg) is an important sucking insect pest which suck-out the milky juice of developing grains causing them degradation in quantity and quanlity. Efforts were made to generate the information on the efficacy of neem and karanj cake used alone and in combination with other organic and inorganic sources of plant nutrients for management of ear bug infesting rice (var. Pusa Basmati-1). The overall results revealed that neem cake (NC)@ 2.5t/ha proved to be the most effective with the minimum incidence of ear bug 9EB) viz.2.02 EB/10hills and karanj cake (KC)@ 2,5t/ha remained almost at par resulting in the lower incidence of the pest viz.2.63 EB/10hills which, in turn, realized grains yield also almost in the similar trends with 41.50 and 38.60q/ha, respectively. It was worthy to note that the highest incidence of the pest 25.09 EB/10 hills was found when the rice plants received the Sole use of N@ 80kg/ha through urea resulting in the substaintially lower yield of grains(22.40 q/ha).It was found that neem and karanj cake @ 0.5 and 1.0t/ha kept as separate treatment(s) supplemented with the rest quantity of N,P,K as per fulfillment of RDF (Recommended dose of fertilizer ) through inorganic sources could also be able to be superior over the rice plants receiving N,P,K through the other organic and inorganic sources, which ultimately suffered with significantly lesser incidence of ear bug resulting in considerably higher yields of grains as well. Based on the overall findings of the field studies it may be concluded that neem and karanj cake, separately, used as organic manure @ 0.5,1.0 and 2.5t/ha proved to be significantly effective in reducing the incidence of ear bug resulting in the substantial enhancement of yields of grains of rice. As such, the lower dose of neem and karanj cake @0.5 and 1.0 t/ha can be used as a part and parcel in the conventional method of rice cultivation and the higher dose of the same @ 2.5t/ha can be used in the organic mode of rice production successfully to manage the pest problem without harming the environment.

Pages: 834-836  |  1642 Views  413 Downloads

Download (452KB)