The study of the effect of nitrogen rate and duration weed interference periods on yield and yield components of corn (Zea mays L.)

摘要

Performance elements, an experience is implemented in summer 2010, at the station of Ahvaz agricultures research center as broken plot in a design framework of accidental blocks with 3 repetition. The main factor of different amount of nitrogen include 3 level N60, N120, N180 kg/lit pure nitrogen of urea resource & secondary factor of weeds intervention include 3 levels (i) continuous weed until the end of corn growth period (w1), (ii) one time weed in 6 leave level (w2), (iii) complete intervention of weed with corn until the end of corn growth period. The acquired results indicated that weed intervention on yield & yield component has a meaningful effect & by increasing the period of weed intervention, the grain yield is reduced. Increasing weed competition make a meaningful effect on grain weight, performance, biological performance & harvesting index. But increasing amount of nitrogen from N120 kg/lit to N180 kg/lit had not a meaningful effect on grain performance & in some cases due to high pressure, the competition from weed make reduction of grain performance, (once weed treatment & all season intervention). In low & high level of nitrogen, biological performance & corn performance is respectively affected by weed. According to the results of this experience, it can be resulted that by reducing competition time of weed, increasing N can make grain performance enhancement. In contrast to weed competition time, increasing nutritive ingredient is an affected weed growth more than agriculture plant &makes weedcompetitionpowerenhancement