Different Methods of Nitrogenous Fertilizer Applications in Order to Decrease Its Environmental Poisonous Effects on the Vegetation and Reproductive Properties, Yield and Protein and Growth Indices of Silage Corn
Recently, a number of accomplishments have been considered to prevent the accumulation of high concentrations of ammonium and the loss of ammonia by volatilization from soils when urea has been applied to t he surface of the soil. The rapid biological hydrolysis of urea can be reduced by the use of urea through different methods. An experiment was conducted to determine effects of urea nitrogen foliar application on the growth indices, yield and protein content of corn (late single cross 704 cultivar) in comparison with current method of urea application (top-dressing) in summer 2008. The experimental site was located at Westside of Esfahan Iran. Experimental design was a completely randomized blocks type of e xperiment, with eight urea treatments. These treatments were consisted of five urea solutions (1, 2, 3 , 4 and 5 percent), two top dressing (200 and 300 Kg/Ha urea) and a control. Each t reatment was replicated 4 times. Treatments were applied at anthesis phase after 1098.5 GDD from planting date. Results showed that the effect of treatments on the plant height and stalk diameter was not significant, but the effect on leaf area was significant. Foliar applications of 3, 4 and 5 percent urea solutions produced maximum leaf area. These effects were consistent till harvest time. Treatments showed to be significant on the dry weight of the stalk, only. On the basis, 5 percent urea solution showed to produce the highest stalk dry weight. Multi-range Duncans test revealed that 3, 4 and 5 percent solutions of urea produced maximum kernel dry weight and total dry weight. Among the yield components (ear number, rows number in ear, kernels number in row, and kernel dry weight) only kernels number in rows was affected by treatments. With this regard, 5 percent urea solution produced maximum kernels number. Results also showed that 5 percent urea solution as foliar application and 200 Kg/Ha as top-dressing produced maximum protein content in kernel and maximum fiber percentage, respectively. Despite of others, growth indices such as LAI, RGR and CGR were affected by experimental treatments and the effects were highly significant. In this respect , 3 percent urea solution produced maximum leaf area index, while 3, 4 and 5 percent solutions produced maximum relative growth rate, and 3 and 5 percent solutions produced maximum crop growth rate.
Nitrogen fertilizer Growth indices Silage corn
Sayed Majid LOHMOUSAVI
Islamic Azad University Falavarjan Branch,Esfahan,Iran
国际会议
2009 International Symposium on Environmental Science and Technology(2009环境科学与技术国际会议)
上海
英文
12-20
2009-06-02（万方平台首次上网日期，不代表论文的发表时间）