تقلیل اثرات تنش آبی در گیاه آفتابگردان به کمک کود آلی ورمی کمپوست و ماده معدنی زئولیت

This study was done at agricultural university research farm, Tarbiat Modarres University, in 2011, with geographic coordinates 35°, and 44 min northern width 51°, and 10 min eastern length, and height of 1215 m from sea, planted in sandy loam soil with 7.29 acidity (Table 1). The factorial experiment was done in a randomized- complete block design (RBD) with three replications. The factors studied at different nutritional systems, such as, F1 (0% vermicompost + 100% chemical + 175% suggested zeolite), F2 (25% vermicompost + 75% chemical + 150% suggested zeolite), F3 (50% vermicompost + 50% chemical + 125% suggested zeolite), F4 (75% vermicompost + 25% chemical + 100% suggested zeolite); and deficit irrigation at three levels, control group treatments (S1): 50% moisture depletion/moisture content (or 50% FC) treatments (S2): 60% moisture content (or 40% FC), treatments (S3): 70% moisture content (or 30% FC). The results showed nutrition system cause to increased, Grain yield, yield components and sunflower harvest index. Drought stress is one of the major abiotic stresses in agriculture worldwide. The study showed the effect of water deficit stress on protein, oil, fatty acids, and sunflower yield; and to reduce adverse effects of water deficit using vermicompost and zeolite. The results showed that the highest percentage of protein was obtained with treatments of S3F4 (35.5%). The highest percentage of oil was obtained from S1F4 (36.173%). This result was obtained in the study of biochemical traits that the drought reduced the chlorophyll a, chlorophyll b, total chlorophyll and the increased proline.