Effects of Nitrogen Rates and Time of Application on Yield of Maize: Rainfall Variability Influenced Time of N Application

Abstract

Despite the fact that maize productivity is relatively better than other major cereal crops, its current productivity is still far below its potential productivity. N rate and time of application are among the major abiotic factors limiting the productivity of the crop. Because of such gaps, the experiment was conducted at Bako Agricultural Research Center in 2013 and 2014 cropping seasons to determine optimum N rate and time of application. Four levels of N rates (46, 69, 92, and 115 N kg ha −1 ) and four levels ( 1 , 2 , 3 , and 4 ) of different time of N application were arranged in factorial combinations. Moreover, previously recommended N and the control were arranged in a randomized complete block design with three replications. In 2013, the highest significant biomass yield (21.2 tha −1 ) was obtained at 115 N kg ha −1 and 4 followed by 69 N kg ha −1 at 1 and 2 and 92 N kg ha −1 at 2 . In contrast, the highest grain yield in 2013 was obtained at 92 N kg ha −1 at 2 followed by 115 N kg ha −1 at either 2 or 4 and 69 N kg ha −1 at either 1 or 3 application time. Interestingly, a significant yield increase by 37% was obtained when 92 N kg ha −1 at the time of 2 was applied compared to previous recommended 110 N kg ha −1 rate and time of application. In 2014, however, the highest yield was recorded when 92 N kg ha −1 at 1 was used. Application of 46 N kg ha −1 at 2 showed statistically similar yield performance when compared with previous N recommendation. The lowest yield was recorded from the control plot in both years. In 2013, the maximum net profit and acceptable marginal rate of return (MMR) were obtained when 92 N kg ha −1 at 2 was used for maize production during erratic and heavy rainfall distribution, particularly at a time of N application. However, the maximum net benefit (30743 ETB ha −1 ) and acceptable MRR could be obtained when 92 N kg ha −1 at 1 was used if the rainfall amount and distribution are relatively uniform. In conclusion, application of 92 N kg ha −1 at 1 (10-15 DAP and 35-40 DAP) is the best N rate and time of application in good rainy seasons and hence recommended for the end users. However, in the case of erratic and heavy rainy seasons, application of 92 N kg ha −1 at three times application regimes (1/3 N at 10-15 days after planting (DAP), 1/3 N at 35-40 DAP and 55-60 DAP) should be used to get maximum profit and acceptable MRR.

Evaluation of Sensor-Based Nitrogen Rates and Sources in Wheat

“…In contrast, the lowest grain yield, except the control, was recorded when 22 kg N ha −1 preplant followed by 33 kg N ha −1 of topdress in Conrad in 2011. These results showed that, in most cases, the higher amount of N applied resulted in higher grain yield, which in consistent with results from other studies [17,18]. Although the application of urea resulted in slightly higher yields compared to UAN, with 1 site-year being virtually equal in yield for both N sources, the differences were no statistically significant.…”

A Review of Methods to Improve Nitrogen Use Efficiency in Agriculture

“…Low NUE of current N management practices is partly due to the poor synchrony between the N application and crop demand [25,27,28]. Bulky pre-plant N applications cause poor synchronization.…”

Drivers, farmers’ responses and landscape consequences of smallholder farming systems changes in southern Ethiopia

“…Figure 4(D)). However, the periodic failure in maize production due to the combined effects of poor rainfall (leading to increased pest issues, in particular maize stemborers), and inadequate soil fertility management (Abebe & Feyisa, 2017) led farmers, with the support of local authorities, to convert part of their land to enset production. Enset, a drought-resistant crop with high cultural value for southern Ethiopia, ensures food for more than 15 million people (Abebe, Wiersum, & Bongers, 2009) and an essential livestock green feed resource during the dry season.…”