Improving grain yield, nitrogen use efficiency and radiation use efficiency by dense planting, with delayed and reduced nitrogen application, in double cropping rice in South China

Fu, Youqiang; Zhong, Xuhua; Zeng, Jia-huan; Liang, Kun; Pan, Junfeng; Xin, Ying-feng; Liu, Yanzhuo; Hu, Xiangyu; BiLin, Peng; Chen, Rongbing; Hu, Rui; Nongrong, Huang

doi:10.1016/s2095-3119(20)63380-9

Cited by 47 publications

(26 citation statements)

References 47 publications

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“…Higher numbers of unfilled grains were observed in six and seven seedlings hill -1 with 23 and 21 unfilled grains, respectively. Thus, as stated by Kobata, Yoshida, Masiko, and Honda (2013) and Fu et al (2021), halving plant density during flowering increased spikelet fertility by 1.3 to 1.5 times, and therefore use of the right number of seedlings hill -1 is more economic.…”

Section: Number Of Filled Grains Panicle-1mentioning

confidence: 80%

Assessment of Seedling Rate per Hill for Irrigated Rice in a Wet Sub-Tropical Condition of Bhutan

Ngawang

Dendup

Tshomo

2022

BJA

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A field experiment was conducted at the research farm of the Agriculture Research and Development Centre (ARDC) Samtenling in Sarpang district of Bhutan in 2020 to assess the effects of transplanting different numbers of seedlings per hill on grain yield and yield components of rice under irrigated conditions. A widely adopted rice variety, Bhur Kambja-1, was used for the study with one to seven seedlings per hill transplanted at 20×20 cm spacing. The experiment was laid out in a randomized complete block design with three replications. The results of the experiment revealed that the number of seedlings per hill had a significant effect on number of tillers per hill and grain yield. In terms of rice grain yield, a significant difference was observed only between three and seven seedlings per hill with a recorded yield of 3.9 and 2.7 t ha-1, respectively. However, no significant effect was established on other yield components, such as the plant height, panicle length, number of grains per panicle, and unfilled grains per panicle. Therefore, this study recommends transplanting three seedlings hill-1 for cultivation of Bhur Kambja-1 rice variety in the wet-subtropical condition of Bhutan as three seedlings per hill yielded significantly higher productivity and could potentially reduce the seed rate.

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Section: Number Of Filled Grains Panicle-1mentioning

confidence: 80%

Assessment of Seedling Rate per Hill for Irrigated Rice in a Wet Sub-Tropical Condition of Bhutan

Ngawang

Dendup

Tshomo

2022

BJA

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“…The numbers of panicles per square meter and grains per panicle are positively associated with yield [27,28]. Studies have suggested that optimizing the total N input and adjusting the topdressing time can increase the number of panicles per square meter, indicating the importance of the number of panicles per square meter in improving yield [29,30]. However, in Northeast China, because of the low temperature, the number of spikelets per square meter is an indicator conventionally targeted by optimizing N application and increasing the transplanting density [31,32].…”

Section: Discussionmentioning

confidence: 99%

Yield and Resource Utilization Efficiency Gap in Early Maturing Japonica Rice Cultivars under Different Management Strategies—A Different Location Investigation

Hu²,

Sun³

et al. 2022

Agriculture

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High input costs and poor management options have resulted in a large rice yield gap. Thus, there is a need to reduce production costs and improve resource-use efficiency by using new cultivation techniques at different locations. The objective of this study was to determine yield and utilization efficiency gaps in early maturing japonica rice under four treatments; no nitrogen application (N0), local farmer practice (FP), high-yield, high-efficiency practice (HYP), and super-high-yield practice (SHY). The average yields under N0, FP, HYP, and SHY were 5012, 7356, 8448, and 9629 kg ha−1, respectively. Differences among treatments were as: N0 to FP (gap 1); FP to HYP (gap 2); and HYP to SHY (gap 3). Yield gaps 1, 2, and 3 were 2337, 1092, and 1181 kg ha−1, respectively. Yield gap was positively associated with panicles per square meter. Yield under HYP and SHY was 14.8% and 30.9% higher than that under FP, respectively. This increase in yield was mainly associated with a higher number of panicles. For resources, gaps 1, 2, and 3 were as follows: water-use efficiency, 0.1706, 0.1513, and 0.1089 kg m−3; radiation-use efficiency, 0.3285%, 0.1780%, and 0.0941%; and heat-use efficiency, 1.8685, 1.0339, and 0.8798 kg °C−1 d−1 ha−1, respectively. The yield was positively correlated with water, radiation, and heat-use efficiencies. The differences in yield and resource-use efficiency were significant between sites. A reduction in yield and efficiency gaps can ensure sufficient panicle per square meter, stabilize grain number per panicle, and increase harvest index and biomass. Overall, HYP is a promising option to increase the yield of early maturing japonica rice yield in cold regions.

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“…The NUE was estimated in rice growth as the relation of the crop N uptake to the total applied or available soil N fertilizer. Accordingly, the amount of N accumulation in plant tissues, nitrogen agronomic efficiency (NAE), nitrogen apparent recovery efficiency (NARE), nitrogen partial factor productivity (NPFP), and nitrogen harvest index (NHI) were calculated using the following equations recommended by [19,43].…”

Section: Determination Of the Nuementioning

confidence: 99%

“…The low NUE of rice has led to excessive and ineffective use of N fertilizer, which has caused serious soil degradation, groundwater pollution, and the emission of ammonia and greenhouse gases [3] as a result of surface runoff losses, leaching into groundwater, and volatilization into the atmosphere. Therefore, many studies have shown that slow-release N fertilizers (SRNFS) are effective in increasing yield and NUE for rice cultivation [18,19], as well as in reducing negative environmental impacts [20]. Hence, the development of water and N-fertilizer-efficient technologies should be pursued, because they can allow rice growers to consistently achieve high grain yields and NUE [21].…”

Section: Introductionmentioning

confidence: 99%

Impacts of Slow-Release Nitrogen Fertilizer Rates on the Morpho-Physiological Traits, Yield, and Nitrogen Use Efficiency of Rice under Different Water Regimes

Aasmi

Hamoud

et al. 2022

Agriculture

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The efficient use of water and fertilizer is vital for optimizing plant growth and yield in rice production. To achieve sustainable rice production and resource management, the ways in which applied water and nitrogen affect the root and shoot morpho-physiology, as well as yield, must be understood. In this study, a pot experiment was conducted to investigate the effects of slow-release nitrogen fertilizer (sulfur-coated urea) application at three levels (light nitrogen (NL), medium nitrogen (NM), and heavy nitrogen (NH)) on the growth, yield, and nitrogen use efficiency (NUE) of rice grown under three water regimes (wetting and soil saturation (WSS), wetting and moderate drying (WMD) and wetting and severe drying (WSD)). The results revealed that differences in water regimes and fertilizer rates led to significant differences in the roots, shoots, yield, and NUE of rice. Increasing the N dosage by 5% enhanced the root and biomass production by 16% in comparison with that of the other groups. The NH×WSS treatment produced the greatest root length, weight, density, active absorption, and oxidation. However, the integration of WSS × NL generated the maximum value of nitrogen apparent recovery efficiency (63.1% to 67.6%) and the greatest value of nitrogen partial factor productivity (39.9 g g−1 to 41.13 g g−1). Transmission electron microscopy (TEM) images showed that plants grown under high and medium nitrogen fertilizer rates with WSS had improved leaf mesophyll structure with normal starch grains, clear cell walls, and well-developed chloroplasts with tidy and well-arranged thylakoids. These results show that TEM images are useful for characterizing the nitrogen and water status of leaves in the sub-micrometer range and providing specific information regarding the leaf microstructure. The findings of this study suggest that the application of NH×WSS can produce improvements in growth traits and increase rice yield; however, the NL×WSS treatment led to greater NUE, and the authors recommend its usage in rice agriculture.

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Improving grain yield, nitrogen use efficiency and radiation use efficiency by dense planting, with delayed and reduced nitrogen application, in double cropping rice in South China

Cited by 47 publications

References 47 publications

Assessment of Seedling Rate per Hill for Irrigated Rice in a Wet Sub-Tropical Condition of Bhutan

Assessment of Seedling Rate per Hill for Irrigated Rice in a Wet Sub-Tropical Condition of Bhutan

Yield and Resource Utilization Efficiency Gap in Early Maturing Japonica Rice Cultivars under Different Management Strategies—A Different Location Investigation

Impacts of Slow-Release Nitrogen Fertilizer Rates on the Morpho-Physiological Traits, Yield, and Nitrogen Use Efficiency of Rice under Different Water Regimes

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