NUTRIENT DYNAMICS: EFFECT ON CROPPING BEHAVIOR, NUTRIENT PROFILE AND QUALITY ATTRIBUTES OF POMEGRANATE (PUNICA GRANATUM L.) UNDER RAINFED AGROCLIMATIC CONDITIONS

摘要

The study was carried out between 2008 and 2010 on 8-year-old pomegranate (Punica granatum L.) trees cultivar 'Kandhari Kabuli.' The potential efficiency of bio-organics used along with chemical fertilizers on cropping behavior, quality attributes, nutrient availability, physico-chemical, and biological properties of soil were investigated. Bioorganic nutrient sources, namely, vermicompost (VC), biofertilizers (BF), farm yard manure (FYM), and green manure (GM), along with chemical fertilizers was evaluated in 13 different treatment combinations. Conjoint treatment application of VC at 20 kg tree(-1), BF at 80 g tree(-1), FYM at 20 kg tree(-1), GM as sun hemp (Crotalaria juncea L.) along with 75% of the recommended dose of nitrogen-phosphorus-potassium (N-P-K) chemical fertilizers significantly resulted in maximum fruit set (52.03%) and fruit yield (34.02 kg tree(-1)). All of the fruit quality characteristics were also improved significantly when compared to nitrogen-phosphorus-potassium (N-P-K) chemical fertilizers. This superior combination also enhanced physical-chemical and biological properties of the rhizosphere soil. Microbial biomass of in terms of Pseudomonas, total culturable soil fungi, Azotobacter chroococcum, actinobacteria, and arbuscular mycorrhizal (AM) fungi improved 385.57, 60.26, 134.19, 168.02, and 39.87%, respectively, over control. This combination also resulted in considerable greater concentration of leaf macro-and micronutrients: N (2.63%), P (0.25%), K (1.57%), iron (Fe; 197.87 mg kg(-1)), copper (Cu; 14.65 mg kg(-1)), zinc (Zn; 59.36 mg kg(-1)), and manganese (Mn; 200.45 mg kg(-1)).