Determine yield response factor of forage corn in water stress conditions, nitroxin and nitrogen different levels (Case study markazi province, Iran)

摘要

Markazi Province is located in central of Iran between 49 o and 48 ' eastern longitude and 34 o and 3' northern latitude. One of the strategy crops in Arak is forage corn. In order to determine the yield response factor (K y ) of forage corn, hybrid ( Maxima ) at different growth stages under water stress, Nitroxin and nitrogen application levels experiment was conducted in 2012 in Arak, under field conditions. This research was examined split - split plot in a randomized complete block design with four replications. Irrigation treatments c onsisted of two levels (I 0 ) and deficit irrigation (I 1 ) as the main factor, Nitroxin in three levels: zero, 0.5 and 1 milliliter per 25 kg of seed and nitrogen levels containing zero, 125 and 250 kg per hectare, which was considered as a minor factor. In o rder to acquire the actual evapotranspiration (ET a ) of net requirement irrigation was measured in the field and to calculate potential evapotranspiration (ET O ) using FAO Penman mantis. To determine the yield response factor (K y ) Stewart's formula was used. Coefficients were calculated for the four growth stages of plant growth, vegetative stage, stem elongation, flowering and ripening product, respectively: 0.24, 1.6, 0.54, 0.28 and 1.6 were obtained for the entire period. The results shown a satisfactory c orrection between k y calculated in this research and other studies.