Trakya University Journal of Natural Sciences (Jun 2016)
THE DETECTION OF APPROPRIATE ORGANIC FERTILIZER AND MYCORRHIZAL METHOD ENHANCING SALT STRESS TOLERANCE IN RICE (Oryza sativa L.) UNDER FIELD CONDITIONS
Abstract
This study was performed in order to identify the appropriate organic fertilizer and mycorrhizal methods for promoting rice tolerance in response to salty environmental conditions. For this purpose, some agronomic, biochemical and physiological parameters were investigated in rice under natural salt stress. The plants were grown in saline field conditions from germination to harvest stage and fertilizing consisted of only a mixture of different ratios of mycorrhizal, municipal solid waste (MSW), waste tea leaves, straw, olive manure and chicken manure. Samples of the plants were taken when they reached harvesting stage and their agronomical properties (plant height, number of leaves, leaf sheaths length, tillering, leaf area, panicle length, total and milled rice values and 1000 grain weight) were recorded and biochemical (chlorophyll a and b) and physiological analysis (Na, K, Ca, Si amounts in roots) were performed. The results showed that improvements in vegetative characters except leaf number were obtained with trials with MSW, MSW+waste tea leaves+straw or MSW+waste tea leaves+straw+chicken or olive manure including fertilizers, increase in chlorophyll b content was obtained with trials except with mycorrhiza, and decreased root Na levels and increases in chlorophyll a content (biochemical parameter) were obtained particularly with trials with of the mycorrhiza+MSW pair or mycorrhiza+MSW+waste tea leave mixture. The best fertilizing mixture, straw (100kg/decare) + MSW (75g / 2,5m2), was in experiment no: 2. Additionally, there was no change in the low yield; but certain additives were necessary. In conclusion, organic waste and mycorrhizal fertilizer applications with specific ratios were determined to have a protective effect on plants against salt stress.
