A newly cultivated sandy soil was supplemented with composted (rice straw, maize stalks, water hyacinth) or farmyard manure (FYM) in the presence and absence of multi-biofertilizers to evaluate its effect on growth, yield and yield components of peanut plants grown in pot experiment. Counts of phosphate dissolving bacteria, Azospirillum spp. and Pseudomonas spp. were always higher in the rhizosphere of plants growing in soil treated with various composted plant residues in the presence and absence of biofertilizers as compared to FYM or chemical fertilizer application. The amendment of soil with composted rice straw recorded higher counts of tested microorganisms in peanut rhizosphere as compared to composted water hyacinth or maize stalks under biofertilizers application. The dry weight of different peanut organs and the fresh weight of nodules were increased as a result of organic wastes fertilization alone or in combined with biofertilizers as compared to chemical fertilizer treatment. Significant differences in peanut yield of pods and seeds were obtained between composted rice straw or water hyacinth along with biofertilizers and NPK treatment (control). Generally, the addition of biofertilizers with different organic wastes led to improve the quantity and quality yield of peanut plants as compared to various organic wastes alone or chemical fertilizer application. Concentration of P, Zn, Mn, Fe and Cu in peanut seeds exhibited marked increases over chemical fertilization as a result of biofertlization under different organic wastes application. Peanut seeds contained the greatest percentage of protein and oil when plants were fertilized with composted water hyacinth or rice straw in the presence of biofertilizers.
The complementary effects between different rates of inorganic and organic fertilization in the presence of multi-biofertilizer and integrated weed managements on tuber yield of potato and associated weeds were studied in two successive seasons in sandy soil. The initial biofertilization, raised the counts of phosphate dissolving bacteria, Azotobacter spp., Azospirillum spp. and Pseudomonas spp. in potato rhizosphere receiving organic manure, compared to chemical fertilizer application under different weed control treatments. Associating biofertilizer with 75 or 50% farmyard manure (FYM) and 25 or 50% NPK fertilization under hand hoeing application respectively, acquired always higher counts of tested microorganisms. The results indicate that the highest number and dry weight of weeds were exerted by using 75% FYM and 25% NPK compared to other fertilization treatments. Application of half rate of metribuzin herbicide and supplementary by one hand hoeing was the master weed control treatment and produced the highest tuber yield. Addition of fertilizing necessity to potato plants as 50% from organic source (FYM) and 50% from inorganic fertilizer (NPK) along with biofertilizer produced the greatest number of tubers per plant, tuber weight and tuber yield with 6.3, 26.3 and 41.7% increases over the standard treatment (100% NPK). Application of 50% FYM + 50% NPK along with biofertilizer recorded the highest values of N, P and K % in potato tubers under different weed control treatments. Generally, under the conditions of the complementary fertilization (50% FYM+ 50% NPK) in the presence of biofertilizer and integrated weed control method (half rate of metribuzin + one hand hoeing), led to maximum tuber yield of potato.
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