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Enhancing rice productivity and Soil Nitrogen Using Dual-Purpose Cowpea-NERICArice Sequence in Degraded Savanna

Journal of Life Sciences 2012年第11期6卷 1237-1250页

作者： Sylvester O. Oikeh Abibu Niang Robert Abaidoo Pascal Houngnandan Koichi Futakuchi Brahima Kone Amadu Toure Africa Agricultural Technology Foundation (AATF) Nairobi PO Box 30709-00100 Kenya Africa rice Center (Africarice) Cotonou O1 BP 2031 Benin Republic Department of Biological Sciences Kwame Nkrumah University of Science and Technology (KNUST) KumasL Ghana Laboratory of Microbial Ecology Faculty of Agronomy University of Abomey-Calavi (FSA/UAC) Cotonou O1 B.P. 526 Benin

ISFM （integrated soil fertility management） involving annual sequencing of dual-purpose early-maturing first crop of cowpeas with biomass incorporation before seeding second crop of early-maturing NERICA （New rice for Africa） was evaluated to enhance rice productivity and soil-nitrogen. Five dual-purpose early-maturing cowpea cultivars and local cultivar （Katche） were seeded early in the wet season in five farmers＇ fields at Ouake （9046＇ N, 1°35′ E, highly degraded-savanna）, Benin. After pod harvest, cowpea residues were minimally worked into the soil using minimum tillage with hand-hoe and seeded with early-maturing, resilient NERICA8 rice that received either 20 kg N/ha or zero-N. Cowpea grain yield averaged 0.1-0.3 Mg/ha, and mean aboveground cowpea biomass produced and recycled was 0.54-0.64 Mg/ha among best cultivars （IT97-568-11 and IT89KD-288）. NERICA8 seeded after cowpea cv. IT97-568-11 and supplied with 20N gave the greatest grain yield of about 2.0 Mg/ha, accounting for 500% heavier grains than fallow-rice rotation with zero-N. Mineral-N dynamics monitored under NERICA8 in year 2 showed that previous IT97-568-11 plots had the highest mineral-N at tillering which persisted till panicle initiation stage. The adoption of an ISFM comprising annual cowpea-NERICA sequence by smallholder rice farmers could enhance productivity and improve N-supply in fragile savannas.

关键词： Degraded savanna dual-purpose cowpea ISFM NERICA rice rice productivity soil nitrogen West Africa.

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Increased ammonification,nitrogenase,soil respiration and microbial biomass N in the rhizosphere of rice plants inoculated with rhizobacteria

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Journal of Integrative Agriculture 2021年第10期20卷 2781-2796页

作者： ZHANG Jun-hua HUANG Jing Sajid HUSSAIN ZHU Lian-feng CAO Xiao-chuang ZHU Chun-quan JIN Qian-yu ZHANG Hui State Key Laboratory of rice Biology China National Rice Research InstituteHangzhou 310006P.R.China Agricultural Resources and Environment Institute Jiangsu Academy of Agricultural SciencesNanjing 210014P.R.China

Azospirillum brasilense and Pseudomonas fluorescens are well-known plant growth promoting ***,the effects of *** and *** on the N cycles in the paddy field and rice plant growth are little *** study investigated whether and how *** and *** contribute to the N transformations and N supply capacities in the rhizosphere,and clarified the effects of *** and *** on the N application rate in rice *** with *** and *** coupled with N application rate trials were conducted in the paddy field in 2016 and *** inoculations of rice seedlings included four treatments:sterile saline solution(M_(0)),***(M_(b)),***(M_(p)),and co-inoculation with a mixture of *** and ***(M_(bp)).The N application rate included four levels:0 kg N ha^(–1)(N_(0)),90 kg N ha^(–1)(N_(90)),180 kg N ha^(–1)(N_(180)),and 270 kg N ha^(–1)(N_(270)).The results indicated that the M_(bp) and M_(p) treatments significantly enhanced the ammonification activities in the rhizosphere compared with the M_(0) treatment,especially for higher N applications,while the Mbp and M_(b) treatments greatly enhanced the nitrogenase activities in the rhizosphere compared with the M_(0) treatments,especially for lower N *** brasilense and *** did not participate in the nitrification processes or the denitrification processes in the *** soil respiration rate and microbial biomass N were greatly affected by the interactions between the rhizobacteria inoculations and the N fertilizer *** the M_(bp) treatment,N supply capacities and rice grain yields showed no significant differences among the N_(90),N_(180),and N_(270) *** N application rate in the study region can be reduced to 90 kg N ha^(–1) for rice seedlings co-inoculated with a mixture of *** and ***.

关键词： N transformation paddy soil plant growth promoting rhizobacteria rice productivity

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OsCPL3 is involved in brassinosteroid signaling by regulating OsGSK2 stability

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Journal of Integrative Plant Biology 2022年第8期64卷 1560-1574页

作者： Luping Gong Shenghao Liao Wen Duan Yongqiang Liu Dongmei Zhu Xiaosheng Zhou Baoping Xue Chengcai Chu Yun-Kuan Liang State Key Laboratory of Hybrid rice Department of Plant SciencesCollege of Life SciencesWuhan UniversityWuhan 430072China Hubei Hongshan Laboratory Wuhan 430070China State Key Laboratory of Plant Genomics Institute of Genetics and Developmental Biologythe Innovative Academy for Seed DesignChinese Academy of SciencesBeijing 100101China

Glycogen synthase kinase 3(GSK3)proteins play key roles in brassinosteroid(BR)signaling during plant growth and development by phosphorylating various ***,how GSK3 protein stability and activity are themselves modulated is not well ***,we demonstrate in vitro and in vivo that C-TERMINAL DOMAIN PHOSPHATASELIKE 3(Os CPL3),a member of the RNA Pol II CTD phosphatase-like family,physically interacts with Os GSK2 in rice(Oryza sativa).Os CPL3 expression was widely detected in various tissues and organs including roots,leaves and lamina joints,and was induced by exogenous BR *** CPL3 localized to the nucleus,where it dephosphorylated Os GSK2 at the Ser-222 and Thr-284 residues to modulate its protein turnover and kinase activity,in turn affecting the degradation of BRASSINAZOLERESISTANT 1(BZR1)and BR *** of Os CPL3 function resulted in higher Os GSK2 abundance and lower Os BZR1 levels,leading to decreased BR responsiveness and alterations in plant morphology including semi-dwarfism,leaf erectness and grain size,which are of fundamental importance to crop *** results reveal a previously unrecognized role for Os CPL3 and add another layer of complexity to the tightly controlled BR signaling pathway in plants.

关键词： brassinosteroids OsCPL3 OsGSK2 plant architecture rice productivity

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Spatial Variability of Soil Properties and rice Yield Along Two Catenas in Southeast China

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Pedosphere 2008年第4期18卷 409-420页

作者： B. RTH B. LENNARTZ Institute for Land Use University of Rostock Justus-von-Liebig-Weg 6 18059 Rostock (Germany).

In the light of an increasing demand for staple food, especially rice, in southeast China, investigations on the specific site potential expressed as the relationship between soil and crop yield parameters gain increasing importance. Soil texture and several soil chemical parameters as well as plant properties such as crop height, biomass and grain yield were investigated along two terraced catenas with contrasting soil textures cropped with wet rice. We were aiming at identifying correlative relationships between soil and crop properties. Data were analyzed both statistically and geostatistically on the basis of semivariograms. Statistical analysis indicated a significant influence of the relief position on the spatial distribution of soil texture, total carbon and total nitrogen contents. Significant correlations were found for the catena located in a sandstone area (Catena A) between rice yield and silt as well as total nitrogen content. Corresponding relationships were not detectable for paddy fields that developed from Quaternary clays (Catena B). As suggested by the nugget to sill ratio, spatial variability of soil texture, total carbon and nitrogen was mainly controlled by intrinsic factors, which might be attributed to the erosional transport of fine soil constituents, indicating the importance of the relief position and slope in soil development even in landscapes that are terraced. The crop parameters exhibited short ranges of influence and about one third of their variability was unexplained. Comparable ranges of selected crop and soil parameters, found only for Catena A, are indicative of close spatial interactions between rice yield and soil features. Our findings show that especially in sandstone-dominated areas, a site-specific management can contribute to an environmentally safe rice production increase.

关键词： rice productivity semivariogram analysis soil properties spatial data

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System of rice Intensification Verses Conventional rice System: Off-farm Field Studies

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NASS Journal of Agricultural Sciences 2019年第1期1卷 7-17页

作者： Ravi Chandra Sharma Nobuhiko Fuwa Pabitra Banik R esearch and Development Division Rashtriya Chemicals and Fertilizer LimitedMumbai 400074 University of Tokyo Japan Agricultural and Ecological Research Unit Indian Statistical InstituteKolkata 700103

With inevitable growth of demand for human and industrial needs,water available for agriculture will become scarcer in the *** is a highly water-stressed ***,India needs to invest in improving its water productivity,and any capacity to produce more rice with less *** of rice Intensification(SRI)has attracted much attention in increasing rice yield per unit *** this study,fifteen farmers were selected those were practicing SRI technology by themselves during the Boro-cultivation season(January-April).The study was continued for three consecutive years 2012 to 14 on the same *** addition to the SRI plots,a similar size of non-SRI plot was maintained in conventional cultivation for comparison *** an average,the non-SR I ight increased by 12%,number of tillers per square meter by 85%,number of reproductive tillers per hill by 286%,weight of panicle per hill by 139%,number of seeds per panicle by 41%and test weight by 26% due to SRI practice over the non-SRI *** increment in straw and grain yield due to SRI over the non-SRI is 70%and 59%*** physico-chemical and biological properties of soil improved due to SRI practice.

关键词： System of rice intensification(SRI) rice productivity Microbial population Soil properties

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Impact of Smart Valley on Soil Moisture Content and rice Yield in Some Lowlands in Burkina Faso

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Agricultural Sciences 2020年第9期11卷 860-868页

作者： Bama Nati Aïssata Delphine Dossou Yovo Elliott Gbané Mahanat Vanessa Gnépi Elvire Soulama Issa Ibrahima Ouedraogo Adama Ouédraogo Institut de l’Environnement et de Recherches Agricoles Département de Production Végétale INERA Ouagadougou Burkina Faso Africa rice Center (Africarice) Cotonou Benin Institut International d’Ingénierie de l’Eau et de l’Environnement Laboratoire Eaux Hydro-Systèmes et Agriculture Ouagadougou Burkina Faso Centre Agricole Polyvalent de Martourkou Bobo-Dioulasso Burkina Faso

To reduce the impact of rainfall variability on lowland rice yields, Burkina Faso state develops lowlands for small rice farmers. However, the high cost of these infrastructures makes impossible to duplicate them to satisfy the needs which are enormous. The Smart-Valley technology which is actually popularized in certain coastal countries of West Africa would therefore be a boon to increase the productivity of the Sudanese lowlands if it well regulates runoff. The object of this study was therefore to know if smart valley technology could increase soil moisture in order to mitigate the impact of drought’s pockets on rice cultivation in the Sudanese lowlands. The experiment takes place in three lowlands during the rainy seasons 2018 and 2019. The climatic data comes from the meteorological stations in the study areas as well as those installed on the sites. The infiltration measurements were carried out using the double Muntz ring. The soil moisture measurement device consisted of a smart valley area of 5 ha and an undeveloped area of 5 ha per site. Sixteen tubes were installed per lowland allowing the humidity to be measured at a depth of 10, 20, 30, 40 cm using a probe. Four rice varieties, Orylux6, FKR62N, FKR19 and FKR64 were tested on plots of 0.25 ha per variety in the smart valley and undeveloped parts. The results showed that the humidity level was 12% higher in the smart-valley plots throughout the cycle compared to the unmanaged area. In addition, humidity decreases rapidly in unmanaged plots as rain becomes increasingly scarce. Finally, the smart-valley development allowed an average increase in rice yields of 21% compared to the average yield of undeveloped plots.

关键词： Smart Valley Soil Moisture Lowland Development rice productivity Rain

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