NDLI: Optimizing Nitrogen and Seed Rate Combination for Improving Grain Yield and Nitrogen Uptake Efficiency in Winter Wheat

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Optimizing Nitrogen and Seed Rate Combination for Improving Grain Yield and Nitrogen Uptake Efficiency in Winter Wheat

Content Provider	MDPI
Author	Mahmood, Hemat Cai, Jian Zhou, Qin Wang, Xiao Samo, Allan Huang, Mei Dai, Tingbo Jahan, Mohammad Shah Jiang, Dong
Copyright Year	2022
Description	Nitrogen (N) supply and seed rate (SR) are two essential factors that affect the accumulation and partitioning of N and dry matter (DM) and, therefore, grain yield (GY) and N use efficiency (NUE). The objective of this experiment was to optimize N application and SR to regulate wheat growth and increase both GY and $NU_{E}$. The results revealed that net photosynthetic rate (Pn), stomatal conductance (Gs), chlorophyll content, and activities of metabolic enzymes (NR and GS) significantly increased with increasing of N levels while decreasing SR. Plant tillers, GY, DM before anthesis, and N translocation, N agronomic efficiency $(NA_{E}$), N recovery efficiency $(NR_{E}$), and N uptake efficiency $(NUP_{E}$) were highest in a combined treatment of $N_{235}$ and $SR_{180}$. However, N levels beyond 235 kg $ha^{−1}$ significantly decreased $NA_{E}$, $NR_{E}$, and $NUP_{E}$. By increasing SR from 135 to 180 kg $ha^{−1}$ an increase of 12.9 % and 9.1% GY and NUPE, respectively, was observed. Based on this result, we estimate that 1 kg N $ha^{−1}$ might be replaced by an increase of approximately 0.6 kg $ha^{−1}$ SR. Our study suggested that using a combination of N and SR $(N_{235}$ + $SR_{180}$) could attain maximum GY and improve $NU_{E}$ parameters.
Starting Page	1745
e-ISSN	22237747
DOI	10.3390/plants11131745
Journal	Plants
Issue Number	13
Volume Number	11
Language	English
Publisher	MDPI
Publisher Date	2022-06-30
Access Restriction	Open
Subject Keyword	Plants Agronomy High Yield Nitrogen Application N Use Efficiency Seed Rate Winter Wheat
Content Type	Text
Resource Type	Article

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