Association of sabai grass (Eulaliopsis binata) and blackgram (Vigna mungo) was studied under three intercropping ratios viz., 1:1, 1:2 and 3:5 for two years under acid lateritic soil. Both sabai grass and blackgram were grown as sole crop for comparison. It was found that leaf yield of sabai grass was significantly higher in intercropping than in monoculture system with the maximum value under 1:2 ratio. Higher land equivalent ratio (up to 2.01) and monetary advantage index (as high as US $ 207.0) was recorded under 1:2 intercropping ratio. The growth and yield of blackgram were affected when intercropped with sabai grass as compared to sole crop. Intercropped blackgram recorded up to 68.7% decrease in grain yield when compared with sole blackgram.
A field experiment was carried out on the neutral soil of Student’s Instructional Farm, Barajaguli, B. C. K. V., Nadia, West Bengal with groundnut during pre-kharif season (Feb-June) of 2001, 2002 and 2003. It revealed that in increasing plant height (cm), no. of branches per plant, leaf area index (LAI), dry matter accumulation (gm per m2) and no. and dry weight (gm) of nodules per plant at different dates of observation, Rhizobiumwas more effective than phosphobacterium. Again it was found that Rhizobium was more effective than phosphobacterium for higher pod yield, shelling percent, oil and protein content. Regarding nutrient concentration Rhizobium had better performance in N and K concentration but phosphobacterium gave better result in P concentration though the uptake of all the three nutrients was higher in Rhizobiuminoculation. Cobalt @ 0.21 kg per ha gave best result in all the above-mentioned parameters.
To meet the food requirement of the ever-growing population of the world the introduction of pesticides in agriculture was a welcome move to control obnoxious weeds below the threshold limit and thereby reduce the yield loss. But continuous use of synthetic herbicides in heavy doses creates environment pollution and increases the number of herbicide resistant weeds. Hence, researches should be done to find out some natural way for minimizing the dependency on synthetic herbicides. The objective of this article is to review the possibilities for using allelopathy to improve overall potentiality of weeds and crops in natural weed management. Allelopathy is the favorable or adverse effect of one plant on another due to direct or indirect release of chemicals from live or dead plants (including microorganisms). Although we cannot discard use of synthetic herbicides completely at the present situation but their use can be reduced up to a certain extent by utilizing allelopathic potentiality as an alternative weed management strategy for crop production as well as environmental benefits.