Hassan Shokri Vahed - Rice Research Institute of Iran, Agricultural Research Education and Extension Organization AREEO, Rasht, Iran
Parisa Shahinrokhsar - Agricultural Engineering Research Department, Guilan Agricultural and Natural Resources Research and Education Center, AREEO, Rasht, Iran
Ali Nazmi - Guilan Agricultural and Natural Resources Research and Education Center, AREEO, Rasht

Micronutrients such as macronutrients are essential for sustainable agriculture and their importance should not be overlooked. In order to study the effect of spraying a mixture of micronutrients in different physiological growth stages of rice plant, a field experiment was conducted in Rice Research Institute of Iran (RRII), in ۲۰۱۵. The experimental design was ۳×۴ factorial in a randomized complete block with three replications. There were four levels of concentration of micronutrient mixture fertilizer [۰ (C۱), ۲ (C۲), ۴ (C۳), ۶ (C۴)] per thousand and three growth stage of rice plant for foliar application [nursery + tillering (T۱), nursery + tillering + booting (T۲), tillering + booting (T۳)] treatments. The results showed that C۲ increased height of plants (۷.۸ %) and number of tiller (۲۸.۵ %) with compare of control (C۱). Yield grain (۳۹۹۲.۳ kg ha-۱) and harvest index (۵۲.۳ %) was increasing with C۴. Nitrogen, manganese and zinc uptake increased in C۴. Different doses of fertilizer showed that height of plant, biological yield and manganese uptake was affected. Mean comparison with slicing method showed significant effects on different doses of fertilizer in T۱. In conclusion, foliar application at T۱C۴ can be helpful to improve yield and nutrient grain of rice.

Element, Growth stage, Rice; Micronutrient, Zinc, Paddy soil, Foliar