Assessment Agro-Physiological Traits Response of Green Bean to Different Level of Nitrogen, Potassium and Zinc Fertilizers

Nutritional management is an important factor in the success of crop production. In order to evaluate different level of nitrogen, potassium and zinc fertilizers on agro physiological characteristics of green bean a field experiment was conducted as split-plot based randomized complete block design in three replications, in Varamin university field research during 2011. The main plot included urea fertilizer at three levels (n1=250, n2=300, n3=350 kg.ha-1). The sub plots consisted b1 (120 kg K.ha-1 from potassium sulfate), b2 (Zn: foliar application of zinc solution with concentration 6 gr.l-1) and b3 (K+Zn =120 kg K.ha-1 and zinc foliar application with concentration of 6 gr.l-1). The results showed that nitrogen uptake increased green bean yield. The interaction between nitrogen level and K and Zn applications was observed that the highest nitrate uptake was obtained that N3B3 treatment. The highest radiation use efficiency (RUE) and chlorophyll were obtained from 350 kg.ha-1 urea with application of (K*Zn fertilizers) treatment. The highest pod yield (4306.2 kg.ha-1) was presented by application of 250 kg.ha-1 urea with K and Zn fertilizers, however the lowest pod yield (2298 kg.ha-1) was observed at 350 kg.ha-1 urea with K. The results of this experiment showed that the Zn-foliar application increased all features in bean and also, reduced nitrate fertilizer rate without reduction in more plant characteristics.