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Effects of nitrogen management on the ratoon crop yield and head rice yield in South USA

Journal of Integrative Agriculture 2021年第6期20卷 1457-1464页

作者： WANG Yue-chao LI Xiu-fen Lee TARPLEY PENG Shao-bing DOU Fu-gen Texas A&M AgriLife Research Center 1509 Aggie DriveBeaumontTX 77713USA National Key Laboratory of Crop Genetic Improvement/Key Laboratory of Crop Ecophysiology and Farming System in the Middle Reaches of the Yangtze River Ministry of Agriculture and Rural Affairs/College of Plant Science and TechnologyHuazhong Agricultural UniversityWuhan 430070P.R.China

Ratoon rice cropping is an important component of the rice cropping system in Texas and south Louisiana,USA,and expanded to Asian countries in *** field studies were conducted with widely planted rice(Oryza sativa L.)cultivars at Eagle Lake,Texas,USA to determine the effects of nitrogen(N)management in main(first)crop(MC)and ratoon(second)crop(RC)on RC *** 2012 and 2013,one cultivar(Presidio)was adopted to determine the effects of RC N management on ratoon yield and head rice *** 2016 and 2017,CL153,CL163 and CL272 in addition to Presidio were adopted to examine the effect of MC N management on ratoon yield and head rice yield.N applied at preflood after MC harvest considerably improved RC *** of 99 kg N ha^(–1)at preflood after MC harvest was practically adequate for RC regrowth,development and approaching the yield potential for *** could produce quite high average grain yields of 5.90 to 6.53 t ha–1 in 2012 and 2013,*** crop N rate only significantly affected MC yield;however,given N applied of 99 kg ha^(–1)at preflood after MC harvest,ratoon yield was not significantly affected by MC N *** the main nor ratoon crop N management had a significant effect on RC head rice *** RC head rice yields(55–65%)were observed in all of the four cultivars and 4 years except for CL272 in *** results indicat that without very high N fertilizer application,rice ratoon crop could produce a considerable grain yield and an expectative head rice *** ratooning could be a practical way to increase rice yields with the minimal input in south Texas and regions with a similar climate.

关键词： rice nitrogen management main crop ratoon crop grain yield head rice yield

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Regulation of 2-acetyl-1-pyrroline and grain quality in early-season indica fragrant rice by nitrogen and silicon fertilization under different plantation methods

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Journal of Integrative Agriculture 2024年第2期23卷 511-535页

作者： Yongjian Chen Lan Dai Siren Cheng Yong Ren Huizi Deng Xinyi Wang Yuzhan Li Xiangru Tang Zaiman Wang Zhaowen Mo State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources College of AgricultureSouth China Agricultural UniversityGuangzhou 510642China Guangxi Key Laboratory of Agricultural Resources Chemistry and Biotechnology Yulin Normal UniversityYulin 537000China Key Laboratory for Conservation and Utilization of Subtropical Bio-Resources Education Department of Guangxi Zhuang Autonomous Region/College of Biology and PharmacyYulin Normal UniversityYulin 537000China Scientific Observing and Experimental Station of Crop Cultivation in South China Ministry of Agriculture and Rural AffairsGuangzhou 510642China Guangzhou Key Laboratory for Science and Technology of Fragrant rice Guangzhou 510642China Key Laboratory of Key Technology for South Agricultural Machine and Equipment Ministry of Education/College of EngineeringSouth China Agricultural UniversityGuangzhou 510642China

Fragrant rice has a high market value,and it is a popular rice type among consumers owing to its pleasant *** methods,nitrogen(N)fertilizers,and silicon(Si)fertilizers can affect the grain yield and fragrance of fragrant ***,the core commercial rice production attributes,namely the head rice yield(HRY)and 2-acetyl-1-pyrroline(2-AP)content of fragrant rice,under various nitrogen and silicon(N-Si)fertilization levels and different plantation methods remain *** field experiment in this study was performed in the early seasons of 2018 and 2019 with two popular indica fragrant rice cultivars(Yuxiangyouzhan and Xiangyaxiangzhan).They were grown under six N-Si fertilization treatments(combinations of two levels of Si fertilizer,0 kg Si ha^(−1)(Si0)and 150 kg Si ha^(−1)(Si1),and three levels of N fertilizer,0 kg N ha^(−1)(N0),150 kg N ha^(−1)(N1),and 220 kg N ha^(−1)(N2))and three plantation methods(artificial transplanting(AT),mechanical transplanting(MT),and mechanical direct-seeding(MD)).The results showed that the N-Si fertilization treatments and all the plantation methods significantly affected the HRY and 2-AP content and related parameters of the two different fragrant rice *** with the Si0N0 treatment,the N-Si fertilization treatments resulted in higher HRY and 2-AP *** rates of brown rice,milled rice,head rice,and chalky rice of the fragrant rice also improved with the N-Si fertilization *** N-Si fertilization treatments increased the activities of N metabolism enzymes and the accumulation of N and Si in various parts of the fragrant rice,and affected their antioxidant response *** key parameters for the HRY and 2-AP content were assessed by redundancy ***,the structural equation model revealed that the Si and N accumulation levels indirectly affected the HRY by affecting the N metabolism enzyme activity,N use efficiency,and grain quality of fragrant ***,high N

关键词： fragrant rice 2-AP content head rice yield mechanical planting nitrogen silicon

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Relationship Between Degree of Starch Gelatinization and Quality Attributes of Parboiled rice During Steaming

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rice science 2016年第6期23卷 339-344页

作者： Ebrahim TAGHINEZHAD Mohammad Hadi KHOSHTAGHAZA Saeid MINAEI Toru SUZUKI Tom BRENNER Moghan College of Agriculture and Natural Resources University of Mohaghegh Ardabili Biosystems Engineering Department Tarbiat Modares University Food Science and Technology Department Tokyo University of Marine Science & Technology Materials & Life Sciences Department Sophia University

Paddy rice samples were parboiled by soaking at 65℃ for 180 min and steaming at 96℃ for 2–10 min,and then dried to achieve the final moisture content of 11% ± 1%. The degree of starch gelatinization （DSG） andseveral quality attributes （head rice yield （HRY）, color value and hardness） of parboiled rice were *** showed that DSG （46.8%–77.9%）, color value （18.08–19.04） and hardness （118.6–219.2 N） allincreased following steaming. In contrast, the HRY increased （64.8%–67.1%） for steaming times between 2–4min but decreased （67.1%–65.0%） for steaming times between 4–10 min. Linear relations between DSG andcolor value （R2 = 0.87）, and DSG and hardness （R2 = 0.88） were observed. The suitable DSG of parboiled riceleading to the highest HRY was found to be 62.5%, obtained following 4 min of steaming.

关键词： parboiling process rice head rice yield color value hardness degree of starch gelatinization

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Influence of Site-Specific Fertilizer Application Using Gps and Digital Fertility Map on rice yield and Quality

Influence of Site-Specific Fertilizer Application Using Gps ...

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亚洲精细农业与计算机农业应用联合大会

作者： Jeong-Hyun Chi Jae-Hong Lee Jung-Soo Park Hee-dong Kim Byoung-rourl Choi Kyung-Yeol Park In-Gue Jung Gyeonggi-do Agricultural Research and Extension Services Hwaseong 445-972 Korea National Academy of Agricultural Science Rural Development Administration Suwon 441-857 Korea

Th is study was conducted to investigate the effect of site-specific variable fertilization following digital fert ility map generated fro m soil analysis on rice growth and yield. The site -specific application of fert ilizer was implemented by using rice transplanter equipped with side dressing applicator and global positioning system（GPS）. Coefficient of variation（C.V.） o f soil nitrogen content was reduced after experiment, and spatial variat ion of semivariogram was reduced. rice g rowth fro m tillering to ripening stage, plant height, tiller and panicle nu mber increased at site -specific variable fertilization treat ment, and coefficient variation（C.V.） of each growth characteristics was lower than those of conventional fertilizat ion treat ment. As a result, rice field uniformity increased by site-specific variable fertilizer application. head rice y ield of site-specific application plot increased by 9% to 492kg/10a fro m 450kg/10a of the control plot, and its CV was significantly reduced to 3.5 compared to 7.8 o f the control plot. In addition, there was no significant difference at amy lose, protein contents and whiteness of milled rice, but its CV was reduced.

关键词： Site-specific variable fertilization Dig ital fertility map So il nitrogen content rice gro wth head rice yield Protein contents

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Influence of Moisture Content,Variety and Parboiling on Milling Quality of rice Grains

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rice science 2014年第2期21卷 116-122页

作者： Abozar NASIRAHMADI Bagher EMADI Mohammad Hossein ABBASPOUR-FARD Hamid AGHAGOLZADE Department of Agricultural Machinery Ferdowsi University of Mashhad Haraz Extention and Technology Developement Centre

The effects of moisture content （8%, 10%and 12%）, variety （Tarom and Fajr） and parboiling on milling quality of rice as a function of milling recovery （MR）, head rice yield （HRY）, degree of milling （DOM） and whiteness were investigated. The parboiled grains was prepared with three soaking temperatures of 25 oC, 50 oC and 75 oC and three steaming times of 10, 15 and 20 min. As a result of parboiling, the increasing rates of MR and HRY values were 7.8%and 14.3%for Tarom and 9.8%and 10.0%for Fajr, respectively, and the decreasing rates for DOM and whiteness were 6.6%and 10.8%for Tarom and 6.8% and 10.5% for Fajr, respectively. Moreover, decreasing moisture content to 8%maximized MR （75.8% for Tarom and 74.3% for Fajr） and HRY （65.8% for Tarom and 57.0% for Fajr） while increasing that to 12%revealed maximum values of DOM （6.1%for Tarom and 6.2%for Fajr） and whiteness （24.8%for Tarom and 28.2%for Fajr）.

关键词： degree of milling head rice yield milling recovery whiteness moisture content parboiling milling quality

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