scholarly journals Assessment of Ammonia Volatilization Losses and Nitrogen Utilization during the Rice Growing Season in Alkaline Salt-Affected Soils

2017 ◽  
Vol 9 (1) ◽  
pp. 132 ◽  
Author(s):  
Yangyang Li ◽  
Lihua Huang ◽  
Huan Zhang ◽  
Mingming Wang ◽  
Zhengwei Liang
Keyword(s):  
Ammonia Volatilization ◽  
Growing Season ◽  
Nitrogen Utilization ◽  
Alkaline Salt ◽  
Salt Affected Soils ◽  
Rice Growing Season

Effects of Nitrogen Application Levels on Ammonia Volatilization and Nitrogen Utilization during Rice Growing Season

Rice Science ◽  
2012 ◽  
Vol 19 (2) ◽  
pp. 125-134 ◽  
Author(s):  
Zhong-cheng LIN ◽  
Qi-gen DAI ◽  
Shi-chao YE ◽  
Fu-guan WU ◽  
Yu-shu JIA ◽  
...  
Keyword(s):  
Ammonia Volatilization ◽  
Growing Season ◽  
Nitrogen Utilization ◽  
Nitrogen Application ◽  
Rice Growing Season

scholarly journals Effect of Heat Resource Effectiveness Change on Rice Potential Yield in Southern China

Processes ◽  
2021 ◽  
Vol 9 (5) ◽  
pp. 896
Author(s):  
Qing Ye ◽  
Xiaoguang Yang ◽  
Wenjuan Xie ◽  
Junmeng Yao ◽  
Zhe Cai
Keyword(s):  
Southern China ◽  
Cropping Systems ◽  
Reduction Rate ◽  
Growing Season ◽  
Scientific Basis ◽  
Yield Reduction ◽  
Percentage Increase ◽  
Potential Yield ◽  
Effective Heat ◽  
Rice Growing Season

During the rice growing season, farmers’ decisions about cropping systems and seed varieties directly affect the utilization of heat resource, and eventually affect the potential yield. In this study, we used the hourly accumulated temperature model to calculate the available heat resource as well as the effective heat resource in southern China. We conducted a spatiotemporal analysis of the heat resource effectiveness during rice growing season and an impact assessment of heat resource effectiveness on rice potential yield and cereal yield reduction. The results showed that, during the period of 1951–2015, heat resource effectiveness generally declined in the rice cropping area of southern China. And this decrease worsened during the most recent three decades compared with the period of 1951–1980. A strong correlation was detected between heat resource effectiveness and rice potential yield in the study area. When the effective heat resource during the growing season increased by 1 °C·d, rice potential yield would increase by 14 kg ha−1. For each percentage increase in heat resource effectiveness, the rice potential yield reduction rate would go down by 0.65%. This agro-climatological study aims to offer a scientific basis for rice production decisions in southern China, such as when to plant, which varieties to choose and so on.

scholarly journals Suspended Solids Export by the Outflowing Water from Irrigation Paddy Field during Rice Growing Season of Korea

2016 ◽  
Vol 49 (2) ◽  
pp. 218-225 ◽  
Author(s):  
Yongseon Zhang ◽  
Kangho Jung ◽  
Hye-Rae Cho ◽  
Kyeong-Hwa Han ◽  
Min-Kyeong Kim ◽  
...  
Keyword(s):  
Paddy Field ◽  
Suspended Solids ◽  
Growing Season ◽  
Rice Growing Season

Effect of a new urease inhibitor on ammonia volatilization and nitrogen utilization in wheat in north and northwest China

2015 ◽  
Vol 175 ◽  
pp. 96-105 ◽  
Author(s):  
Qianqian Li ◽  
Ailing Yang ◽  
Zhaohui Wang ◽  
Marco Roelcke ◽  
Xinping Chen ◽  
...  
Keyword(s):  
Ammonia Volatilization ◽  
Northwest China ◽  
Nitrogen Utilization ◽  
Urease Inhibitor

Changes in fertilizer-induced direct N2O emissions from paddy fields during rice-growing season in China between 1950s and 1990s

2009 ◽  
Vol 15 (1) ◽  
pp. 229-242 ◽  
Author(s):  
JIANWEN ZOU ◽  
YAO HUANG ◽  
YANMEI QIN ◽  
SHUWEI LIU ◽  
QIRONG SHEN ◽  
...  
Keyword(s):  
Growing Season ◽  
Paddy Fields ◽  
N2o Emissions ◽  
Rice Growing Season

scholarly journals Effects of straw incorporation on nitrogen absorption of split fertilizer applications and on rice growth

2019 ◽  
pp. 59
Author(s):  
Jicheng Zheng, Gang Zhang, D. Wang, Z. Cao, C. Wang ◽  
Dezhi Yan
Keyword(s):  
Root Growth ◽  
Late Stage ◽  
Dry Matter ◽  
Early Stage ◽  
Growing Season ◽  
Total N ◽  
Residual Rate ◽  
Negative Effect ◽  
Straw Incorporation ◽  
Rice Growing Season

A greenhouse experiment investigated the effect and mechanism of straw incorporation (0 and 6 t ha−1) on the absorption of fertilizer nitrogen (N) of split applications and on the growth of rice shoots and roots. N fertilizer was split into: (1) base fertilizer (BF), incorporated before transplanting; (2) tillering fertilizer (TF), broadcasted at tillering stage; and (3) panicle-formation fertilizer (PF), broadcasted at panicle-formation stage. 15N-urea was used as one of three splits. To evaluate the hypothesis that straw incorporation influences the 15N absorption of one split by enhancing 15N immobilization or changing root growth, we measured the 15N residual rate in soil at maturity and root growth throughout the rice-growing season. Straw incorporation significantly decreased 15N absorption of BF, accompanied by significantly higher 15N immobilization in soil than in the no-straw treatment. However, straw incorporation significantly increased 15N absorption of top-dressing (both TF and PF), accompanied by significantly greater dry matter and length of surface roots (0–5 cm depth) throughout the rice-growing season (top-dressing 15N was seldom found in soils > 5 cm). Shoot dry matter with straw incorporation decreased significantly in the early stage but increased in the late stage, compared with the no-straw treatment, and shoot total N with straw incorporation decreased significantly throughout the rice-growing season (this negative effect had decreased by the late stage). To better synchronize N supply with rice demand and reduce the risk of water eutrophication, N levels of BF and top-dressing should be reviewed when straw is incorporated.

scholarly journals Ca2+/Na+ Ratio as a Critical Marker for Field Evaluation of Saline-Alkaline Tolerance in Alfalfa (Medicago sativa L.)

Agronomy ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 191
Author(s):  
Tian-Jiao Wei ◽  
Chang-Jie Jiang ◽  
Yang-Yang Jin ◽  
Guo-Hui Zhang ◽  
Ming-Ming Wang ◽  
...  
Keyword(s):  
Traditional Method ◽  
Explanatory Power ◽  
Field Evaluation ◽  
Field Conditions ◽  
Stem Length ◽  
Alkaline Salt ◽  
Physiological Indices ◽  
Alkaline Tolerance ◽  
Medicago Sativa L ◽  
Salt Affected Soils

Current indices of saline-alkaline (SA) tolerance are mainly based on the traditional growth and physiological indices for salinity tolerance and likely affect the accuracy of alfalfa tolerance predictions. We determined whether the inclusion of soil alkalinity-affected indices, particularly Ca2+, Mg2+, and their ratios to Na+ in plants, based on the traditional method could improve the prediction accuracy of SA tolerance in alfalfa, determine important indices for SA tolerance, and identify suitable alfalfa cultivars in alkaline salt-affected soils. Fifty alfalfa cultivars were evaluated for their SA tolerance under SA and non-SA field conditions. The SA-tolerance coefficient (SATC) for each investigated index of the alfalfa shoot was calculated as the ratio of SA to non-SA field conditions, and the contribution of SATC under different growth and physiological indices to SA tolerance was quantified based on the inclusion/exclusion of special alkalinity-affected indices. The traditional method, excluding the special alkalinity-affected indices, explained nearly all of the variation in alfalfa SA tolerance, and the most important predictor was the SATC of stem length. The new method, which included these special alkalinity-affected indices, had similar explanatory power but instead identified the SATC of shoot Ca2+/Na+ ratio, followed by that of stem length, as key markers for the field evaluation of SA tolerance. Ca2+, Mg2+, and their ratios to Na+ hold promise for enhancing the robustness of SA-tolerance predictions in alfalfa. These results encourage further investigation into the involvement of Ca2+ in such predictions in other plant species and soil types under more alkaline salt-affected conditions.

scholarly journals Quantification of Cultivar Change in Double Rice Regions under a Warming Climate during 1981–2009 in China

Agronomy ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 794 ◽  
Author(s):  
Xiaolei Qiu ◽  
Liang Tang ◽  
Yan Zhu ◽  
Weixing Cao ◽  
Leilei Liu
Keyword(s):  
Global Warming ◽  
Management Practices ◽  
Growing Season ◽  
Rice Production ◽  
Future Climate Change ◽  
Rice Productivity ◽  
Double Rice ◽  
Late Rice ◽  
Early Rice ◽  
Rice Growing Season

Maintaining high double rice productivity in China is very important for ensuring the food security of China. However, the double rice production system is sensitive to changes in both climate and management practices. Previous studies showed that rice production has been negatively impacted by global warming without considering the changes of cultivars and management practices. However, cultivar improvements and the impact of cultivar change must not be ignored in any assessment. In the current study, we combined data analysis with crop modeling to investigate the impacts of changes in climate and cultivars on rice productivity at three different double rice sites (Nanchang, Hengyang, and Gaoyao) in China. The results showed a warming trend at the study sites during 1981–2009, and the temperature increase rates (maximum, average, and minimum temperatures) in the late rice growing season were larger than in the early rice growing season. Global warming has led to a reduction in the length of the rice growth period. Adopting new rice cultivars may partially mitigate the declining trend of the growing duration and grain yield, but it would not completely compensate for the negative impact observed in double rice regions. In general, the changes in cultivars prolonged the growing duration by increasing the basic vegetative phase and the photoperiod formation phase. The main reasons for yield improvement were the increase in the percentage of filled grains for early rice and the increase in grain number per spike for late rice. In the face of future warming, breeding efforts are necessary for producing new cultivars that are resilient to the negative impacts of future climate change on agriculture.

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