RELATIVE EFFICACY OF ORGANIC MANURES IN IMPROVING RESISTANCE AND PEST TOLERANCE OF OKRA (CV. PARBHANI KRANTI)

摘要

Field experiments were carried out to evaluate relative efficacy of organic manures in improving pesl tolerance of okra crop in lateritic soil. Three commercial manures viz., processed city waste (PCW), vermicompost (VC) and oil cake pellets (OCP) were assessed in relation to farmyard (FYM) alone and in combination with microbial culture (MC). These organic manures were also used in combination with chemical fertilizers (CF) to assess the usefulness of such treatments against application of only CF.The influence of organic manures on resistance of okra to pests was assessed and it was observed that under no pest control treatment, per cent affected with borer in case of okra was 41%, 21% 71% 44%. 26% 59% and 17%, (average of two years) with different nutrient sources PCW, VC, OCP, FYM+MC, FYM, CF and UC respectively. With regard to influence of organic manures on tolerance of crop to attack by pests, the treatment with FYM imparted maximum tolerance as edible fruit yield recorded was highest compared to othe treatment under condition where no pest control measures were adopted. The extent of tolerance with FYM treatment against the treatments PCW, VC, OCP, FYM+MC, CF and UC was 26% 36% 78% 12%, 71% and 145% respectively (average of two years).