Effect of foliar application of organic fertilizer complements on grain yield, yield components and quality in two rice (Oryza sativa L.) cultivars

To evaluate the effect of organic fertilizer complements application (Aminol Forte, Fosnutren and Kadostim) on grain yield, milling properties and nitrogen use efficiency of two rice (Oryza sativa L.) cultivars, a field experiment in factorial layout and randomized complete block design with 10 treatments and 3 replications was conducted at Rice Research Institute of Iran in 2009. Treatments included: fertilizer in 5 levels [complete chemical fertilizer (for cv. Khazar: nitrogen 90, phosphorus 45 and potassium 75 kg.ha-1 and for cv. Hashemi: nitrogen 60, phosphorus 30 and potassium 50 kg.ha- 1, respectively, complete chemical fertilizer + organic fertilizer complements (Aminol Forte, Fosnutren and Kadostim one l.ha-1 as a foliar application in tillering, booting and milk stages), 50% of chemical fertilizer + organic fertilizer complements, organic fertilizer complements and control (no fertilizer application)] and two rice cultivars (cv. Khazar and Hashemi). Traits that been measured were; grain yield and yield components, morphological characteristics, milling properties and nitrogen use efficiency. Results indicated that experimental treatments had a significant effect on the tillers fertility, number of filled grain. panicle-1, grain yield and 1000 grain weight. In this traits, complete chemical fertilizer and complete chemical fertilizer + organic fertilizer complements treatments had had similar effects and lowest amount obtained from organic fertilizer complements and control (no fertilizer application) treatments. The highest grain yield (5371 kg.ha-1) obtained in complete chemical fertilizer + organic fertilizer complements treatment. Organic fertilizer complement treatment and 50% of chemical fertilizer + organic fertilizer complement treatment showed the highest nitrogen uptake efficiency (26.4 kg.kg-1) and nitrogen harvest index (48.3 %), respectively. Results indicated that organic fertilizer complements application, eliminated chemical fertilizers rate that enhanced nitrogen uptake efficiency parameters.