Results 1 to 10 of about 2,221 (138)
Effects of Different Mulching Measures on Distribution of Organic Carbon and Inorganic Carbon in Soil Aggregates Under Spring Maize Cultivation [PDF]
, 2023 [Objective] The effects of different mulching methods on the distribution of organic and inorganic carbon in soil aggregates on the Loess Plateau, and the mechanism under which soil aggregates sequester carbon under mulched conditions were determined in ...
Li Meng +8 more
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Ultrasound in Obstetrics &Gynecology, Volume 60, Issue 3, Page 381-389, September 2022., 2022 ABSTRACT Objective To evaluate the performance of third‐trimester ultrasound for the diagnosis of clinically significant placenta accreta spectrum disorder (PAS) in women with low‐lying placenta or placenta previa. Methods This was a prospective multicenter study of pregnant women aged ≥ 18 years who were diagnosed with low‐lying placenta (< 20 mm from
N. Fratelli +42 more
wiley +1 more source
Relationship Between Land Use Carbon Balance and Human Activity Intensity in Tuojiang River Basin [PDF]
, 2023 [Objective] The synergistic relationship between land use carbon balance and human activity intensity were studied in order to provide a reference for regional collaborative carbon emission reduction planning in the Tuojiang River basin, and thereby meet
Gao Xuesong, Wang Qi, Zhang Wenying
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1980年代的山東農村科教電影放映:以全国首届農林科教電影匯映月為例 [PDF]
, 2023 application/pdf都市文化研究.
29645, 趙, 晟
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Shuitu Baochi Xuebao, 2022 为明确不同覆盖方式对旱地马铃薯田土壤耗水、耗水规律、水分利用效率、产量及产量形成的影响,在陇中半干旱农区设置了玉米秸秆带状双行覆盖(SSM2)、玉米秸秆带状单行覆盖(SSM1)、玉米秸秆全覆盖(SFM)、地膜春覆盖(PMS)和地膜秋覆盖(PMA)5种覆盖方式,以传统露地平作为对照(CK)。结果表明:2年试验中,玉米秸秆带状覆盖和地膜覆盖处理土壤贮水消耗量较CK分别增加13.5,14.8 mm。玉米秸秆带状覆盖能显著提高降水对马铃薯耗水贡献率,不同降雨年型内均以SSM2处理贡献率最高,2年分别为95.6 ...
纪文宁 +6 more
doaj +2 more sources
Ghosts in the shell: the promises of water users' associations and the double life of Elinor Ostrom's design principles in rural China [PDF]
, 2023 Water is a matter of great concern for the PRC, especially for its agricultural sector, besieged by shortage, soil degradation, and raising production costs.
Pia, Andrea E.
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DNDC模型和TOPSIS法联合确定生物降解地膜覆盖农田合理施氮量
Shuitu Baochi Xuebao, 2022 为明确干旱区最优覆盖地膜类型和施氮制度，于内蒙古河套灌区木垒滩节水试验站进行为期2年的不同类型地膜覆盖农田不同施氮量试验。在高氮水平（传统施氮336 kg/hm2）下设置3种覆膜处理，包括塑料地膜（PFM3）、生物降解地膜（BFM3）和无膜覆盖处理（NFM3）；同时在生物降解地膜覆盖下设立3个施氮水平，包括中氮（BFM2，276 kg/hm2）、低氮（BFM1，216 kg/hm2）和不施氮（BFM0，0 kg/hm2），共6个处理。利用2年观测的产量、吸氮量和氮淋失量对DNDC模型进行率定和验证 ...
冷旭, 李仙岳, 郭宇, 丁宗江
doaj
Shuitu Baochi Xuebao, 2000 我国覆膜稻栽培研究始于１９９６年，但迄今都为地膜单元覆盖，水稻秸秆＋地膜二元覆盖旱作栽培效应的研究结果表明，秸秆＋地膜二元覆盖旱作稻田土壤变温幅度降低，水分散失减少，结构改善，养分积累增加；水稻无效分蘖减少，生育转变提前，灌浆结实期延长，穗大粒多，千粒重高，增产效果显著，稻谷产量较地膜覆盖，秸秆覆盖，露地旱作栽培分别增产１０．３％，８．９％，２３．２％。
杨安中
doaj +2 more sources
Shuitu Baochi Xuebao, 2023 为探明不同栽培措施下全膜覆土穴播种植对不同基因型冬小麦生产的土壤水分状况、产量和品质的影响,为旱作冬小麦覆膜适水种植与农业绿色可持续高质量生产提供依据。采用普通聚乙烯地膜覆土穴播(PE)和生物降解地膜全膜覆土穴播(BM)2种覆盖材料种植方式,以传统露地穴播(LD)为对照,研究不同栽培措施对冬小麦土壤水分状况、产量、水分利用效率和主要品质的影响。结果表明,在干旱气候和作物耗水影响下,地膜覆盖处理较LD降低0—300 cm土层土壤平均含水量,BM较PE显著降低0—300 cm土层土壤水分 ...
王磊 +8 more
doaj
Evaluation of the Effectiveness of Soil Improvement Measures in Apple Orchards on the Loess Plateau: A Meta-Analysis [PDF]
[Objective] Soil acidification, structure and fertility degradation and poor water-holding capacities are common problems in the apple orchard on the Loess Plateau, effective soil improvement techniques are crucial for enhancing soil quality, and ...
DUAN Shunxia +3 more
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