scholarly journals Peer Review #2 of "Shoot and root traits of summer maize hybrid varieties with higher grain yields and higher nitrogen use efficiency at low nitrogen application rates (v0.1)"

2019 ◽  
Author(s):  
S Cruz-Izquierdo
Keyword(s):  
Peer Review ◽  
Nitrogen Use Efficiency ◽  
Root Traits ◽  
Nitrogen Application ◽  
Summer Maize ◽  
Nitrogen Use ◽  
Maize Hybrid ◽  
Application Rates ◽  
Use Efficiency ◽  
Low Nitrogen

scholarly journals Shoot and root traits of summer maize hybrid varieties with higher grain yields and higher nitrogen use efficiency at low nitrogen application rates

PeerJ ◽  
2019 ◽  
Vol 7 ◽  
pp. e7294
Author(s):  
Wennan Su ◽  
Muhammad Kamran ◽  
Jun Xie ◽  
Xiangping Meng ◽  
Qingfang Han ◽  
...  
Keyword(s):  
Grain Yield ◽  
Nitrogen Use Efficiency ◽  
Root Distribution ◽  
Nitrogen Application ◽  
Nitrogen Use ◽  
Maize Hybrid ◽  
Grain Yields ◽  
Application Rates ◽  
Use Efficiency ◽  
Low Nitrogen

Breeding high-yielding and nitrogen-efficient maize (Zea mays L.) hybrid varieties is a strategy that could simultaneously solve the problems of resource shortages and environmental pollution. We conducted a 2-year field study using four nitrogen application rates (0, 150, 225, and 300 kg N hm−2) and two maize hybrid varieties (ZD958 and QS101) to understand the plant traits related to high grain yields and high nitrogen use efficiency (NUE). We found that ZD958 had a higher grain yield and nitrogen accumulation in the shoots at harvest as well as a higher NUE at lower nitrogen application rates (0 and 150 kg hm–2) than QS101. The grain yields and NUE were almost identical for the two hybrid varieties at nitrogen application rates of 225 and 300 kg N hm–2. Compared with QS101, ZD958 had higher above-ground and below-ground biomass amounts, a deeper root distribution, longer root length, root active absorption area, greater grain filling rate, and higher photosynthetic NUE than QS101 at lower nitrogen application rates. Our results showed that ZD958 can maintain a higher grain yield at lower nitrogen rates in a similar manner to N-efficient maize hybrid varieties. The selection of hybrids such as ZD958 with a deeper root distribution and higher photosynthetic NUE can increase the grain yield and NUE under low nitrogen conditions.

Improvements in Grain Yield and Nitrogen Use Efficiency of Summer Maize by Optimizing Tillage Practice and Nitrogen Application Rate

2019 ◽  
Vol 111 (2) ◽  
pp. 666-676 ◽  
Author(s):  
Lichao Zhai ◽  
Ping Xu ◽  
Zhengbin Zhang ◽  
Benhui Wei ◽  
Xiuling Jia ◽  
...  
Keyword(s):  
Grain Yield ◽  
Nitrogen Use Efficiency ◽  
Application Rate ◽  
Nitrogen Application ◽  
Tillage Practice ◽  
Summer Maize ◽  
Nitrogen Use ◽  
Use Efficiency ◽  
Nitrogen Application Rate

Effects of Soil Fertility and Nitrogen Application Rates on Super Rice Yield, Quality, and Nitrogen Use Efficiency

2012 ◽  
Vol 37 (11) ◽  
pp. 2020-2029 ◽  
Author(s):  
Jun ZHANG ◽  
Hong-Cheng ZHANG ◽  
Xiang-Mao DUAN ◽  
Zong-Jin XU ◽  
Bo YANG ◽  
...  
Keyword(s):  
Soil Fertility ◽  
Nitrogen Use Efficiency ◽  
Rice Yield ◽  
Nitrogen Application ◽  
Nitrogen Use ◽  
Application Rates ◽  
Use Efficiency ◽  
Yield Quality

Effects of Nitrogen Application Rates on Rice Grain Yield, Nitrogen-Use Efficiency, and Water Quality in Paddy Field

2015 ◽  
Vol 46 (12) ◽  
pp. 1579-1594 ◽  
Author(s):  
Zuozhen Dong ◽  
Lianghuan Wu ◽  
Jie Chai ◽  
Yuanhong Zhu ◽  
Yuanli Chen ◽  
...  
Keyword(s):  
Water Quality ◽  
Grain Yield ◽  
Nitrogen Use Efficiency ◽  
Paddy Field ◽  
Rice Grain ◽  
Nitrogen Application ◽  
Nitrogen Use ◽  
Application Rates ◽  
Use Efficiency

scholarly journals SIMULATING THE EFFECT OF CLIMATE CHANGE ON WINTER WHEAT PRODUCTION AND WATER / NITROGEN USE EFFICIENCY IN IRAQ: CASE STUDY

2021 ◽  
Vol 52 (4) ◽  
pp. 999-1007
Author(s):  
Masood & Shahadha
Keyword(s):  
Climate Change ◽  
Winter Wheat ◽  
Air Temperature ◽  
Nitrogen Use Efficiency ◽  
Field Experiments ◽  
Root Zone ◽  
Nitrogen Application ◽  
Nitrogen Use ◽  
Application Rates ◽  
Use Efficiency

The objective of this study was to investigate the capability of modifying the irrigation and nitrogen application rates as an adaptation to climate change, especially, increasing air temperature, using the Root Zone Water Quality Model (RZWQM2). Field experiments were conducted in the winter wheat season of 2015-2016 and 2019-2020 at the Rasheed County, south of Baghdad, Iraq. The effect of increasing air temperature on the water use efficiency, nitrogen use efficiency, and grain yield of wheat was assessed under different irrigation deficits and nitrogen application rates. Three levels of water depletion: 30, 50, and 70 of available water and four N application rates (0, 140, 200, and 260 kg N ha−1) were applied for winter wheat. Two temperature scenarios in the RZWQM2 were created for the study purpose. The first scenario was to add 2Co to the normal temperature, and the second scenario was to add 4Co to the normal temperature. Results showed that high irrigation levels presented better results than the low levels under projected temperature scenarios. However, all applied nitrogen rates presented similar results under projected temperature (2Co and 4Co scenarios). Therefore, modifying irrigation requirements is a workable adaption strategy to the increased temperature.

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