Shuitu Baochi Xuebao, 2006 根据18年的长期定位试验，探讨了不同施肥处理对黄土丘陵区栗褐土土壤容重、土壤结构、孔隙性、水分物理性质以及对土壤有机质和土壤氮，磷含量的影响。结果表明，长期施用有机肥有利于保持和改善土壤孔隙状况，促进水稳性团聚体的形成，提高土壤的透水性和持水能力。单施化肥与不施肥相比，土壤物理性质有所改善，但与初始值比较则变劣。有机肥与化肥配合施用，可减轻化肥对土壤物理性质的不良影响。长期不施肥土壤物理性质有恶化趋势。单施有机肥和有机无机肥配合施用可显著提高土壤有机质和氮、磷含量，有机无机肥配合施用效果更明显 ...
王改兰 +3 more
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Shuitu Baochi Xuebao, 2007 基于15年石灰性潮土长期定位施肥试验，用水浸提法、Olsen法、Mehlich3法研究土壤磷素有效性。结果表明：长期不施磷的处理，土壤磷素有效性常年维持在本底的极低水平；施磷均能增加水溶性磷、Olsen—P、Mehlich3-P的含量，但磷钾配施及大量施用有机肥的效果最明显，其次是有机肥与NPK配施，只施无机肥（NPK，NP）增加的幅度相对较小；然而，在当前的施磷水平下，土壤“不缺磷”，但不能建立较大的有效磷库，并且以Olsen—P、Mehlich3-P的临界点为标准，土壤磷素流失的风险不大；水溶性磷 ...
雷明江 +5 more
doaj
[Metabolomic alterations in preterm infants with bronchopulmonary dysplasia]. [PDF]
Zhongguo Dang Dai Er Ke Za ZhiWu YY +10 more
europepmc +1 more source
[Impact of aspirin use on pregnancy outcomes in patients with systemic lupus erythematosus]. [PDF]
Beijing Da Xue Xue Bao Yi Xue BanLi X, Zhao J, Mu R.
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[Research on the microhardness and microstructure of permanent tooth enamel in childhood]. [PDF]
Hua Xi Kou Qiang Yi Xue Za ZhiGu Q, Jiang W, Liu Y, Liu L, Gao L.
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[A case report of retroperitoneal infantile fibrosarcoma with <i>RBPMS-NTRK3</i> fusion gene positivity]. [PDF]
Zhongguo Dang Dai Er Ke Za ZhiZhou XY, Jiang J, Wang LZ, Guo JH.
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Sheng Wu Yi Xue Gong Cheng Xue Za ZhiYang B +6 more
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Nan Fang Yi Ke Da Xue Xue BaoZhang Y +10 more
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Zhongguo Dang Dai Er Ke Za ZhiRen JN, Wan Y, Zhu XF.
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