排序方式: 共有9条查询结果,搜索用时 15 毫秒
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中越水稻迁飞性害虫稻飞虱、稻纵卷叶螟发生关系分析 总被引:3,自引:0,他引:3
中越两国同属东亚季风区,水稻病虫害在发生危害上为一个整体。每年水稻稻飞虱、稻纵卷叶螟(以下简称"两迁"害虫)随着季节和气温变化,在两国间往返迁飞,发生为害,相互影响。研究两国水稻迁飞性害虫发生的关系和影响规律,对于提高监测预警的早期预见性和防控工作的主动性,有效控制其危害具有重要意义。2010年以来,中越两国实施了中越水稻迁飞性害虫监测与防治合作项目,通过连续多年开展交流合作,初步明确了越南"两迁"害虫发生规律。本文简要分析了影响越南"两迁"害虫发生的主要因素,探讨了中越两国水稻"两迁"害虫发生规律的相关性,对提高中国"两迁"害虫中、长期预报能力和综合治理水平发挥了积极作用。 相似文献
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In vitro and in silico studies of salicylic acid on systemic induced resistance against bacterial leaf blight disease and enhancement of crop yield 下载免费PDF全文
Wannaporn THEPBANDIT Narendra Kumar PAPATHOTI Jayasimha Rayulu DADDAM Nguyen Huy HOANG Toan LE THANH Chanon SAENGCHAN Kumrai BUENSANTEAI 《农业科学学报》2023,22(1):170-184
Salicylic acid (SA) is an effective elicitor to promote plant defenses and growth.This study aimed to investigate rice(Oryza sativa L.) cv.Khao Dawk Mali 105 treated with salicylic acid (SA)-Ricemate as an enhanced plant protection mechanism against bacterial leaf blight (BLB) disease caused by Xanthomonas oryzae pv.oryzae (Xoo).Results indicated that the use of SA-Ricemate as a foliar spray at concentrations of more than 100 mg L–1 can reduce the severity of BLB disease by 71%.SA-Ric... 相似文献
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Viet-Ngu HOANG Trung Thanh NGUYEN Clevo WILSON Thong Quoc HO Uttam KHANAL 《农业科学学报》2021,20(12):3339-3351
The Vietnamese agricultural sector has experienced a dramatic structural change based on increased specialization in rice cultivation. However, small-scale rice-farmers have continued to grow multiple crops, especially in less developed provinces. While the literature advocates crop diversification for reasons of both economic and ecological sustainability, there lacks empirical evidence as to whether crop diversification brings efficiency and productivity gains to small farms. The present study is the first applications of the input-oriented stochastic distance function approach in estimating scale and scope economies using data of multi-crop farming households in Vietnam. We find strong evidence of product-specific economies of scale. Scope economies are also present for rice, vegetable, and other annual crop production. This suggests that crop diversification enhances efficiency and productivity. However, there still exists significant technical inefficiency in crop production, indicating opportunities to expand farm output at the existing level of inputs and technologies. More specifically, our empirical results indicate that it is desirable to expand vegetable and other annual crop production in mountainous areas while rice cultivation can be further expanded in delta and coastal regions. 相似文献
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HOANG THU THAO 《山东饲料》2013,(8):35
Laws on Personal Income Tax in Vietnam officially effected and implemented in social,economic life on 01/01/2009.However,management of personal income tax is posing big challenges on managers.First of all,the law includes some new points as compared to Ordinance of Personal Income tax on high income earners,especially the regulation related to family situation to calculate taxable income.The implementation started in context of economic recession,stagnation in investments,increasing in unemployment and reduction in citizens income.Besides there are problems related to bilateral and multilateral commitments among countries about range for levying personal income tax.Due to those reasons,the author chose topic "Solution to improve the Vietnamese Personal Income Tax system in the context of international economic integration". 相似文献
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