排序方式: 共有47条查询结果,搜索用时 15 毫秒
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在红松育苗地施用生物有机肥料,研究其对土壤微生态环境以及对红松苗生长的影响。试验结果表明:生物有机肥料可以提高红松育苗地的微生物数量、改善pH值、有机质及速效N、P、K等微生态指标,促进红松苗的生长。 相似文献
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应用生物技术提高烟草对野火病抗病性的研究进展 总被引:3,自引:2,他引:1
自80年代中后期以来,在应用生物技术提高植物抗病性方面取得了重大进展。对应用生物技术提高烟草对野火病抗病性的研究进展进行了综述。 相似文献
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制浆生物技术的研究与工业应用 总被引:16,自引:3,他引:13
综述了制浆工业中生物技术研究的发展简史,务类酶制剂在制浆工业中的研究与应用概况,着重介绍了当前制浆生物技术研究热点这一的木聚糖酶的研究与应用。同时简介了制浆生物技术的研究进展。 相似文献
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几种生物农药对平腹小蜂的毒性 总被引:9,自引:0,他引:9
荔枝蝽(Tessaratoma papillosa)是荔枝和龙眼最重要的害虫之一,平腹小蜂(Anastatus japonicus) 能大量寄生荔枝蝽卵,对荔枝蝽起着很好的控制作用。但由于荔枝和龙眼需经常使用农药防治病虫害以保证荔枝和龙眼的高产高质,为使化防和生防统一协调,本文就几种果园常用的生物农药对平腹小蜂的毒性进行了研究。1 材料与方法1.1平腹小蜂:用柞蚕卵繁殖,由广东省昆虫研究所提供。1.2试验农药:10种生物性农药,其中尽种是B.t类杀虫剂,1种是病毒,5种是植物性杀虫剂。它们依次是高… 相似文献
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黄瓜基础理论研究进展 总被引:3,自引:1,他引:2
对黄瓜的研究近况从基础理论研究,包括生理生化,遗传育种,采后生理,栽培和生物技术和应用等方面进行综述,并讨论了该领域今后的研究方向。 相似文献
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Ingrid E van Putten Soile Kulmala Olivier Thébaud Natalie Dowling Katell G Hamon Trevor Hutton Sean Pascoe 《Fish and Fisheries》2012,13(2):216-235
In the domain of decision‐support tools for the management of marine fish resources, considerable attention has been paid to the development of models explaining how fish stocks change over space and time. In most models, fishing effort is assumed to be exogenous and determined by factors such as management. Increasingly, there has been a call for bio‐economic models to also account for the dynamics of fishing fleets, recognizing that fishers respond to changing environmental, institutional and economic conditions. A growing literature has sought to explicitly model the endogenous determinants of the capacity of fishing fleets, the intensity of its use and its temporal and spatial allocation across fishing opportunities. We review this literature, focusing on empirical applications of the behavioural models that have been put forward to explain and predict observed fleet dynamics. We find that although economic factors are usually included as a dominant driver in most studies, this is often based on the use of proxy variables for the key economic drivers, for which adequate data are lacking. Also, while many studies acknowledge that social and social–psychological factors play a significant role in explaining observed fishing behaviour, their inclusion in fishing fleet dynamic models is still very limited. Progress in this domain can only be achieved via the development of multidisciplinary research programmes focusing on applied quantitative analysis of the drivers of fishing fleet dynamics. 相似文献