共查询到20条相似文献,搜索用时 218 毫秒
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山西核桃新品种嫁接技术 总被引:1,自引:0,他引:1
1核桃新品种近几年来,我省各地选育出不少核桃优良新品种。这些新品种分早实和晚实两个类型。1.1早实核桃新品种。据汾阳、浮山、代县3个不同试区试验认为,目前,有12个核桃新品种,适宜在全省发展,其共同特点是优质丰产。这12个新品种是:(1)扎343号;... 相似文献
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1993年进行的5个苏柳新品种丰产育苗试验,结果表明,以株行距40cm×50cm为最佳密度,其次是20cm×50cm。通过试验摸索出一套苏柳新品种育苗技术,同时为海涂,江滩造林及园林绿化起了一定的促进作用。 相似文献
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通过对国外橡胶树优良品种IAN873在西双版纳24年适应性观察研究,结果表明:该品种生长快,开割前年均增粗5.65cm,高于对照RRIM600(5.06cm)10.67%;林相整齐,开割时平均茎粗50.5cm,开割率80.2%,分别比对照高2.8cm和10.4%;产胶量中等,1-16割年平均干胶产量1 310kg/hm2,为对照RRIM600(1 969kg/hm2)的66.55%;年平均单株产量为4.0kg,略低于对照RRIM600(4.2kg/年.株)0.2kg;抗辐射寒害能力中等偏下,抗寒力小于GT1,但较RRIM600强;耐割性强,割胶16年后死皮发病率为15.79%,病指14.95,分别比对照(28.79%、27.58)轻13个百分点和12.63。 相似文献
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滇东南橡胶树寒害后次期性害虫危害状况调查 总被引:1,自引:0,他引:1
调查了2011年1月云南滇东南橡胶树遭受特大寒害后,引发了以橡胶树小蠹虫类为主的次期性害虫的严重发生和危害,共调查橡胶树6 541株,其中受小蠹虫危害株418株,橡胶树虫蛀率6%,共采集成虫标本232头,种类分属小蠹科Scolytidae、长小蠹科Platypodidae、锯谷盗科Siovanidae、露甲科Nitidulidae等4科4属5种,暗翅材小蠹(Xyleborus semiopacus)和对粒材小蠹(Xyleborus perforans)为优势种;调查还对由于频繁的自然灾害和长年的营养失衡导致橡胶树群体衰退是橡胶林次期性害虫大发生的潜在和根本的原因进行探讨;提出需要对滇东南植胶环境重新研究和评价,对植胶半个多世纪所依循的技术体系和经营体制进行重新审视,以期实现重大变革,使滇东南植胶业得以持续发展。 相似文献
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经苗圃系比、初级系比和适应性系比试验表明:云南省热带作物科学研究所选育的橡胶新品种云研77—4产量较高、抗寒性较强,副性状良好。1—6割年平均单株产干胶2.65kg,为对照GT1的128.6%,抗寒系比区1—7割年平均单株产干胶3.9kg,为对照GT1的158.5%,生长比GT1快16%—19%,7年可开割,抗寒能力比GT1强 相似文献
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Tapping-tree density in rubber plantations affects the production of dry rubber. Farmers can estimate rubber productivity when they know with certainty the number of tapping trees within a plantation and can therefore increase productivity through optimized planting schematics. Historical data on planting distance between trees and between rows, planting density (trees/ha) and tapping-tree density (number of trees under tapping for latex harvest per hectare) from 1952 to 2014 have been collected for plantations in the Hainan, Yunnan and Guangdong provinces of South China. A plantation survey was conducted to collect more detailed data on current tapping tree and planting densities in various plantations in the three provinces. Planting density and row spacing are found to have increased with rubber tree planting time and plant spacing to have declined from 1952 to 2014. Tapping-tree density of rubber plantations from 1955 to 1995 in South China ranges from 270 to 345 tree/ha, averaging 300 trees/ha. Strong typhoons and cold snaps are important drivers of fluctuations in tapping-tree density. The factors driving tapping-tree density are similar across the three provinces but the degree of change differs between provinces. Tapping panel dryness (due to tapping beyond the natural limit of the rubber tree productivity), severe wind damage and cold damage are the major factors resulting in loss of tapping trees in plantations in South China. These results suggest that a combination of environmental management for extreme weather and targeted breeding could improve tapping-tree density in rubber plantation and therefore dry rubber yield per unit area. 相似文献
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分析了当前云南天然橡胶产业面临的发展机遇及挑战。为适应新的形势,巩固提升云南天然橡胶产业,提出了进一步合理利用宜胶资源,加强产业体制创新、机制创新和科技创新,促进产业持续发展的意见。 相似文献