Effects of Raised Bed Planting and Nitrogen on Nitrogen Efficiency Indices and Yield of Wheat
Article Type:
Research/Original Article (دارای رتبه معتبر)
Abstract:
IntroductionNitrogen use efficiency (NUE) for wheat is only about 30%, but with best management practices it can be improved to higher levels. Optimal nitrogen (N) management is essential for maximum NUE, crop yield and minimum environmental impacts. Applying less N may result in lower grain yields and reduced grain quality. However, higher N application can result in reducing NUE and increasing fertilizer losses. Efficient use of applied N fertilizer improves crop yield and decreases the production cost. N application and recovery efficiencies depend on soil criterias; method and rate of fertilizer application; and planting methods. Improving NUE is one ecological approach for producing higher grain yield. In recent years, some researchers found that suitable management and adoption of appropriate practices could improve agricultural nitrogen use efficiency and crops production would be more efficient. Raised bed planting has shown to improve water distribution and efficiency, fertilizer use efficiency, reduced crop lodging and decreased seed rate without sacrificing yield. Planting methods could also affect the vertical distribution of leaf area index and radiation use efficiency of wheat.
The objectives of this study were to determine the effects of raised bed planting and Urea fertilizer levels on the nitrogen efficiency indices and yield of wheat.
Materials and MethodsThis experiment was conducted as split plot based on a randomized complete block design with three replications at the Agricultural Research Field, Ferdowsi University of Mashhad during the growing season of 2015-2016. The main and sub factors were allocated to planting methods (raised bed and conventional methods) and Urea rates such as 0, 100, 200, 300 and 400 kg Urea ha-1, respectively. Investigated traits were grain yield, biological yield, nitrogen content of grain, nitrogen content of straw, and efficiency indices of nitrogen (nitrogen uptake efficiency, nitrogen utilization efficiency and NUE). The treatments were run as an analysis of variance (ANOVA) to determine if significant differences existed among treatments means. Multiple comparison tests were conducted for significant effects using the LSD test.
Results and DiscussionResults showed that the simple and interaction effects of planting methods and Urea rates were significant (p≤0.05) on grain yield, biological yield, grain nitrogen content, straw nitrogen content, nitrogen uptake efficiency, nitrogen utilization efficiency and NUE of wheat. The maximum and minimum grain yield were observed with raised bed planting and 300 kg Urea ha-1 (7545 kg ha-1) and conventional planting and control (3865 kg ha-1), respectively. The maximum and the minimum amounts of nitrogen uptake efficiency were belonged to raised bed planting and control (0.45 kg N in plant per kg N in soil) conventional planting and 400 kg Urea ha-1 (0.14 kg N in plant per kg N in soil), respectively. The highest and lowest NUE were related to raised bed planting and control (36.65 kg N in grain per kg N in plant) conventional planting and 400 kg Urea ha-1 (10.63 kg N in grain per kg N in plant), respectively. Increasing in Urea rate from 0 to 400 kg ha-1 fertilizer decreased nitrogen use efficiency up to 62 percent.
ConclusionsResults showed a higher grain yield and biological yield from planting on raised bed compared with the conventional planting, owing to higher nitrogen uptake and nitrogen use efficiency. Biological yield was significantly influenced and higher trend was found with higher dose of nitrogen. There was a trend to improve grain yield with the increase of Urea levels. Grain yield increased in raised bed planting method compared with conventional planting mostly due to more fertile topsoil on the raised beds. Enhancing nitrogen fertilizer led to improve in grain yield and a decrease in NUE.
Language:
Persian
Published:
Iranian Journal of Field Crops Research, Volume:16 Issue: 1, 2018
Pages:
243 to 261
magiran.com/p1823185  
دانلود و مطالعه متن این مقاله با یکی از روشهای زیر امکان پذیر است:
اشتراک شخصی
با عضویت و پرداخت آنلاین حق اشتراک یک‌ساله به مبلغ 990,000ريال می‌توانید 70 عنوان مطلب دانلود کنید!
اشتراک سازمانی
به کتابخانه دانشگاه یا محل کار خود پیشنهاد کنید تا اشتراک سازمانی این پایگاه را برای دسترسی نامحدود همه کاربران به متن مطالب تهیه نمایند!
توجه!
  • حق عضویت دریافتی صرف حمایت از نشریات عضو و نگهداری، تکمیل و توسعه مگیران می‌شود.
  • پرداخت حق اشتراک و دانلود مقالات اجازه بازنشر آن در سایر رسانه‌های چاپی و دیجیتال را به کاربر نمی‌دهد.
دسترسی سراسری کاربران دانشگاه پیام نور!
اعضای هیئت علمی و دانشجویان دانشگاه پیام نور در سراسر کشور، در صورت ثبت نام با ایمیل دانشگاهی، تا پایان فروردین ماه 1403 به مقالات سایت دسترسی خواهند داشت!
In order to view content subscription is required

Personal subscription
Subscribe magiran.com for 50 € euros via PayPal and download 70 articles during a year.
Organization subscription
Please contact us to subscribe your university or library for unlimited access!