مياه الري الممغنطة و مكافحة الأدغال بمبيد الأترازين و أثرها في معايير نمو محصول الذرة الصفراء

الملخص EN

A field experiment was conducted at the experimental Farm, Department of Field Crop Science, College of Agriculture-University of Baghdad, during spring and autumn seasons of 2010 to investigate the response of maize (Buhoth106) to magnetized irrigation water and atrazine for weed control, and their impacts on growth analysis parameters.

A randomized complete block design arranged according to split-plot was used with four replicates.

The study included four levels of magnetized irrigation water strength 0 (normal irrigation water), 500, 1000 and 2000 Gauss as main plot treatments, while four levels of weed control treatments (weedy, 2kg.h-1 atrazine, 4kg.h-1 atrazine, and weed free) as subplot treatments.

The results showed a significant positive effect of magnetized irrigation water on most growth characters studied.

Magnetized irrigation water at 2000 Gauss caused highest reduction of weed densities in both seasons at 60 days after sowing and recorded 56.25 plant.

m-2 at spring and 30.50 plant.

m-2 at autumn compared with 67.38 and 39.94 plant.m-2 with normal irrigation water at both seasons, respectively, thereby achieved greater percentage of weed control of 43.62 and 55.51 % compared with 32.25 and 42.15 % with normal irrigation water at both seasons, respectively.

Magnetized irrigation water at 2000 gauss also affected crop growth parameters such as crop growth rate, and recorded 18.63 and 21.04 g.m-2.day-1 compared with 13.85 and 15.23 g.m-2.day-1with normal irrigation water at both seasons, respectively.

However magnetized irrigation water caused no significant effects on net assimilation rat, relative growth rate although greater increased value was observed for both growth parameters.

Results also showed the weed control treatment of weed free and 2 and 4 kg.h-1atrazine affected significantly crop growth rat and gave 19.82,15.83 and 17.50 g.m-2.day-1respectively compared with 12.44g.m-2.day-1of weedy treatment at spring season, and 23.27,17.47 and 17.42 g.m-2.day-1respectively compared with 14.24 g.m-2.day-1of weedy treatment at autumn season.

Weed free treatment at both seasons, however, It gave greatest value of net assimilation rat and relative growth rat.Conclusion could be drawn from the present study that magnetized irrigation water and weed control treatment may improve some maize growth analysis parameters.