Zeitschrift für Agrarwissenschaft und Lebensmittelforschung
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Abstrakt

Effect of Organic and Inorganic Fertilizers on Rice and Some Nutrients Availability under Different Water Regimes

Howida Elhabet

Water and fertilizer management are essential to achieve high yield potential in irrigated rice soils. The effect of inorganic, organic fertilizers and their combinations under different irrigation intervals on yield and its attributes of Sakha 106 rice cultivar as well as, the availability of some nutrients (ammonium, nitrate, phosphorus and potassium) in the soil were investigated. A field experiment was conducted at the Experimental Farm Sakha Agriculture Research Station, Kafr El-Sheikh, Egypt, during 2016 and 2017 rice growing seasons. Five rates of fertilizers; control without any fertilizer application (T1), 4.76 tons farm yard manure (FYM) /ha (T2), 4.76 tons of composted rice straw (CRS)/ha (T3), 4.76 tons FYM +110 N kg/ha (T4), 4.76 tons CRS +110 kg N/ha (T5) and the recommended dose of nitrogen, 165 kg N/ha (T6) were used under five irrigation treatments namely; continuous flooding (W1), continuous saturation (W2), irrigation every 6 days (W3), irrigation every 9 days (W4) and irrigation every 12 days (W5). The results indicated that W1 and W2 caused an increase in chlorophyll content, number of tillers/m2, number of panicles/m2, panicle weight (g), number of filled grains/panicle, panicle weight, straw yield (t/ha) and grain yield (t/ha) without any significant difference among them. The greatest values of all studied characters were observed with fertilizer treatments T5 and T6 under the irrigation treatments W1, W2, W3 and W4. The highest amounts of nutrients (NH4+ and P) availability were found under flooded condition (W1) followed by W2, W3 and W4 especially with T5 treatment. Whereas, the maximum values of nitrate (NO3-) availability were found under W5 followed by W4. Potassium was mostly available under W2 followed by W1 in 2016 and 2017 seasons.