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针对吉林省优质米生产过程中存在的优质品种产量低、抗病性差、优质不优价等诸多问题,从品种选择、育苗技术、插秧技术、本田施肥等技术环节阐述了水稻优质高效栽培技术。 相似文献
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水稻纹枯病菌毒素致病机理研究 总被引:6,自引:0,他引:6
Crude toxin of Rhizoctonia solani(RS-toxin) caused obvious damage to the cell of rice.The permeability of cell membrane changed and phosphorous permeated exterior when the sheath and leaves were treated with RS-toxin.After 12 hours treated with RS-toxin,chloroplast membrane was damaged and lamella was relaxed and swollen,with some cavities in the chloroplast.Treated with RS-toxin for 36 hours,the chloroplast was disassembled,other organelles became unclear and disappeared such as mitochondria,and some parts of the cell wall thinned and loosed.Treated with 10 times diluted RS-toxin,the chlorophyll content in the rice plants was reduced over 85%.With higher RS-toxin concentration and longer treatment time,the lower the chlorophyll content became. 相似文献
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秦岭太白山区鹿蹄草根际与非根际土壤养分及酶活性研究 总被引:1,自引:0,他引:1
【目的】分析秦岭太白山区不同林分下鹿蹄草的根际和非根际土壤养分和酶活性状况,探索其空间变异规律,为野生鹿蹄草资源的保护提供依据。【方法】采用野外调查和室内分析的方法,对秦岭北坡太白山区4种林分下鹿蹄草根际与非根际土壤养分及酶活性差异及其相互间的关系进行研究。【结果】在鹿蹄草根际和非根际间,土壤有机质、全氮、有效氮、速效磷、速效钾均呈现出明显的根际聚集现象,根际平均富集率分别达34.64%,58.29%,126.94%,114.02%,96.38%,土壤全钾含量基本保持不变。土壤酶也表现出根际活性较强的特性,根际土壤脲酶、转化酶、过氧化氢酶、酸性磷酸酶活性比非根际土壤分别高出32.04%,22.40%,30.57%,8.17%。在鹿蹄草根际土壤中,有机质、速效钾含量与脲酶、转化酶、过氧化氢酶、酸性磷酸酶活性均呈极显著正相关,有效氮、速效磷含量与脲酶呈极显著正相关;而在非根际土壤中,有机质与转化酶、脲酶呈极显著正相关,速效磷含量与 4种酶活性均呈显著正相关。【结论】秦岭北坡太白山区鹿蹄草根际和非根际土壤养分与酶活性密切相关,各土壤酶活性之间也存在不同程度的相关性,较好地反映了鹿蹄草生境的土壤肥力状况。因此,土壤酶活性可以作为评价该区域土壤肥力的指标之一。 相似文献
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