Influence of farmyard manure, biological inoculation and organic extract on peanut productivity under organic farming system in sandy soil

A field experiment was carried out for two successive summer seasons (2007and 2008) in sandy soil at EL- Ismailia Agriculture Research Station El-Ismailia Governorate to study the effect of farmyard manure(FYM) applied at different rates 0,10,20,30 and 40 m. fed with either inoculation with a mixture of biofertilizer P (Bacillus megatherium), K (Bacillus Circulans) dissolving bacteria and N2 -fixer (Bradyrhizobium) or non -inoculation. All plots of experiments were foliar treated with different rates (100 and 200 and 400 L fed. 1 ) of organic extract (rabbit manure). Results indicated that mean values of peanut yield components increased significantly due to the application of high rate of FYM ; these increases were 81.2% and 79.7% for seeds and straw, respectively. High rates of organic extract were more effective as compared to lower rate . Moreover, using mixed inoculation treatment, also, affected significantly the peanut yield (seeds and straw) as compared to non -inoculation ones. In addition, data indicated that FYM applied at a rate of 40m. fed increased N,P and K uptake by peanut seed and straw as compared to control treatment. Similar trend was obtained when soil inoculated with (a mixture of P, K dissolving bacteria and N2-fixer)as compared to non-inoculation. Results also revealed that high rate of organic extract was more effective for N,P and K uptake as compared to the other applied rates. The interaction between tested treatments showed that the highest peanut seed yield and N and P and K uptake were accompanied with 40 m. fed. 1 FYM application and inoculation with (mixing of P and K dissolving bacteria and N2-fixer) combined with foliar application with high rates of organic extract(400 L fed. 1). On the other hand, mean values of some chemical properties of the tested soil (pH and EC and OM% and available macronutrients (N and P and K) revealed that values of pH decreased due to the applied treatments. The recorded values showed that the use of 40 m. fed . 1 FYM, inoculation and foliar application with organic extract (400 L fed. 1) caused decreases in pH values as compared to the other treated treatments. An opposite trend was encountered with mean values of EC, percentages of OM and available N and P and K in soil, which had increased due to applied treatments. These parameters had more affected as a result of the application of high rate of both FYM and organic extract; bacterial inoculation also being more favorable as compared to non- inoculation.