南宁地区低产果园现状及对策探讨

1998年南宁地区水果总面积已达到 1 2 76万ｈｍ2投产面积 6 0 9万ｈｍ2 ,总产量达 3 3 71万ｔ,水果总产值达 1 0 2 8亿元 ,占农业总产值的 1 0 2 2 %;农民人均有果61 83ｋｇ,人均水果收入 2 1 3 3 7元 ,占农民人均收入1 0 1 8%;水果总产量、总产值、农民人均收入分别比1 990年增长 2 53倍、6 75倍和 1 71倍。但是 ,目前水果生产中仍然存在单位面积产量低、投产率低、产品质量差。“两低一差”严重困扰着南宁地区水果生产的发展。1　低产果园现状据统计 ,到 1 998年底南宁地区果树投产面积为6 0 9万ｈｍ2 ,低产果园为 2 3 2万ｈｍ2…     

对辽宁省蔬菜产业结构调整的探讨

１　蔬菜产业结构的调整是产销形势发展的要求　　１９９７年辽宁省蔬菜播种面积３９．６７万ｈｍ２,总产量１６５２万ｔ,总产值１１８亿元,占农业总产值的２１．８４％。其中保护地蔬菜设施面积９．８７万ｈｍ２,播种面积１９．６万ｈｍ２,占蔬菜播种面积的４９．４％。与１９９２年相比,蔬菜播种面积、总产量、总产值的年平均递增率分别为７．９３％、１２．３６％和２３．０１％,保护地蔬菜年平均递增率分别为３０．６％、２３．１％和２４．６％。全省年人均蔬菜占有量４２０ｋｇ,是全国平均数的１．６３倍。全省蔬菜年产值已达…     

提高蔬菜产业效应的十项举措

近年来因农业产业结构调整,蔬菜栽培面积不断扩大。目前全国蔬菜栽培面积已达到1200万ｈｍ2,总产量达到37000万ｔ,总产值2500亿元,占全国经济作物总产值的50%;江西省蔬菜栽培面积56万ｈｍ2,总产量达到1118万ｔ,总产值85亿元,占全省经济作物总产值的76%(1998年统计年报)。我们抚州市1999年年报统计蔬菜栽培面积7.448万ｈｍ2,总产量14.575万ｔ。以上数据表明,蔬菜的产值仅次于粮食,已成为农业增收、农民受益和稳定农村经济的支柱产业。但从当前蔬菜发展的形势看,产品数量日趋饱和,产销市场竞争激烈,已出现卖菜难,蔬菜生产如不顺应市场,实行精…     

提高商品蔬菜产值的途径

近年因农业产业结构调整 ,蔬菜栽培的面积大幅度增长。目前全国蔬菜栽培面积已达 12 0 0万ｈｍ2 ,总产量达到 370 0 0万ｔ,总产值 2 50 0亿元 ,占种植业总产值的 17.5% ,占经济作物总产值的 50 % ,蔬菜的产值仅次于粮食 ,高于林业和渔业的总产值 ,已成为农业增收、农民受益和稳定农村经济的支柱产业。从当前商品蔬菜发展的形势看 ,产品数量日趋饱和 ,蔬菜产销市场竞争激烈 ,商品蔬菜生产如不认真策划而盲目发展 ,必将造成极大的损失。为此 ,对如何提高商品蔬菜的产值进行探讨 ,供参考选用。1　提高单位面积产量蔬菜生产由于种类多 ,栽培的技…     

基于SWOT分析的广西蔬菜产业发展战略

1 广西蔬菜产业发展现状 1.1 总量持续增长,自给有余但外销不足 从2000年以来,广西蔬菜种植面积连年递增,增幅4.1%.2000年,蔬菜播种面积90万hm2,总产量1 686.6万t,总产值(种植业)约130.78亿元;2008年全区蔬菜播种面积117.33万hm2,总产量达2 330.82万t,总产值210亿元.     

永川市蔬菜产业发展现状及对策

介绍了重庆永川市蔬菜产业的现状,2004年蔬菜播种面积为1.2万hm2,其中,净作蔬菜种植0.67万hm2,粮菜、果菜间套种植0.53万hm2.无公害蔬菜基地333.33 hm2,大棚种植蔬菜60余hm2.蔬菜总产量达31.5万t,总产值达2亿元,占永川市农业总产值25.2亿元的8%.作者还提出了永川市蔬菜产业的发展对策.     

优化种植业结构发展食用菌产业

奉新地处赣西北 ,是一个传统农业县 ,素有“稻米之乡”的美誉。全县有土地面积16 4 2ｋｍ2 ,总人口 2 8.5万 ,其中农业人口 2 2 .2万 ,水田 2 .88万ｈｍ2 。现有蔬菜种植面积5 333ｈｍ2 ,其中商品蔬菜面积 80 0ｈｍ2 ,反季节蔬菜 5 33ｈｍ2 ,蔬菜大棚 2 0 0 0个 ,1997蔬菜总产量达 10万余ｔ,人均蔬菜占有量达 40 0ｋｇ。为充分利用和发挥我县的资源优势 ,合理调整和优化农业产业结构 ,实现富县富民的目标 ,奉新县委、县政府于 1998年作出了实施食用菌等 5个农业产业化工程的决策 ,并从1998年开始在全县正式铺开。经过全县上下的共同努力 ,我…     

基于SWOT分析的广西蔬菜产业发展战略

1 广西蔬菜产业发展现状 1．1 总量持续增长,自给有余但外销不足 从2000年以来,广西蔬菜种植面积连年递增,增幅4．1％。2000年,蔬菜播种面积90万hm^2,总产量1686．6万t,总产值（种植业）约130．78亿元;2008年全区蔬菜播种面积117．33万hm^2,总产量达2330．82万t,总产值210亿元。目前,广西蔬菜生产基本上实现了周年生产,均衡应市,满足了本地消费需求,     

我国蔬菜生产发展迅速

1999年全国蔬菜种植面积达 1334 .7万ｈｍ2 ,比 1998年增长 8.6% ,比 1985年增长181%。其中 ,种植面积最大的是山东省 ,达147.7万ｈｍ2 ,其次是河南省 ( 10 4 .9万ｈｍ2 )。1999年全国蔬菜总产量达 4 .0 5亿ｔ,比 1998年增长 5.2 % ,比 1985年增长 2 2 4 %。其中产量最高的是山东省 ( 640 7.2万ｔ) ,其次是河北省( 3815.4万ｔ)。在蔬菜种类上 ,种植面积超过百万公顷的有大白菜 ( 2 0 2 .1万ｈｍ2 )、辣椒( 12 5.1万ｈｍ2 )、萝卜 ( 112 .8万ｈｍ2 )、黄瓜( 10 6.5万ｈｍ2 ) ,番茄面积为 93.1万ｈｍ2 。摘自《’99中国农业统计资料》本刊编辑…     

我国蔬菜科技五十年的主要成就与今后的任务

建国５０年来,我国蔬菜生产和科学技术取得了令世人瞩目的成就。１９９８年,全国蔬菜播种面积已达１１２７万ｈｍ２,总产量３．４５亿ｔ,人均年占有鲜菜２７６ｋｇ,市场蔬菜数量充足,供应基本均衡,花色品种增加,商品质量有所提高,价格相对平稳。生产基地进一步巩固,产销一体化进程加快,生产现代化程度逐步提高。全国蔬菜年总产值已达到２５００亿元,在种植业中仅次于粮食。在蔬菜产业的蓬勃发展中,科技进步发挥了重大作用。在蔬菜业产前、产中、产后各个环节,处处体现了科技进步的支撑。１　我国蔬菜科学技术的主要成就新中国…     

怎样给蔬菜进行根外追肥

根外追肥是与土壤施肥相辅相成的，是蔬菜生产上一种经济速效的提高产量和改善品质的施肥方法（即叶面施肥），它可以通过叶面直接吸收利用．尤其在蔬菜生长后期．根系老化，吸收运输能力衰弱时喷施．可以迅速补充植株体内养分的不足或营养失衡．促进蔬菜生长旺盛。防止早衰，延长供应朋。根外追肥在茄果类或瓜类生育期长，分批采收的蔬菜上效果尤为明显。     

海南“澄迈福橙”敲响大超市的门

口感好硒含量高采摘期长,这是海南省“澄迈福橙”的特点,澄迈县将福橙促销瞄准大超市。2009年2月20日,该县在省城海口市召开福橙品尝推介会,向超市促销这一地方名牌农产品。     

西洋梨栽培的品种选择

依引进西洋梨品种的表现，换成熟期初步选择介绍了6个较有发展前途的优良品种。     

Willingness to travel to avoid recreation conflicts in Danish forests

Conflicts among forest visitors have direct effects on the quality of a recreational experience. As the number of visitors to forests close to residential areas increases, as well as the number of different activities, so does the potential for perceived conflicts. According to the literature, expanding knowledge of conflict characteristics and their causes is important for recreation planners and managers who aim to reduce conflicts.In the present study, different forest user groups were identified and categorised according to their pursued activities, and for each group, causes of conflict were identified. Furthermore, a choice experiment was constructed to estimate the distance visitors are willing to travel to encounter few visitors as opposed to many visitors, and thereby potentially experience fewer conflicts. Comparing the marginal willingness to travel (WTT) of different user groups suggests that some groups have a WTT further than the average to reach a forest with ‘Few’ visitors. The average WTT to reach a forest area with ‘Few’ visitors. ‘Mountain bikers,’ ‘Peace and nature lovers’ and ‘Horse riders’ are willing to travel 4 km more than the average per visit to reach a less crowded forest. At the other end of the scale, we find that people who are doing physical exercise are willing to travel 2 km less than the average to reach a less crowded forest.     

桃砧木筑波4号和筑波5号抗根癌病鉴定评价

以当年实生筑波4号(Prunus persica‘tsukuba-4’)和筑波5号(Prunus persica‘tsuku-ba-5’)的新梢为材料,采用人工接种发根土壤杆菌(Agrobacterium rhizogenes)的方法研究了其对根癌病的抗性及其分离情况。结果表明,筑波4号实生群体中免疫、高度抗病、中度抗病、中度感病和高度感病类型分别占0.90%、1.80%、9.01%、18.92%和69.37%。筑波5号实生群体中免疫、高度抗病、中度抗病、中度感病和高度感病类型分别占1.01%、3.03%、8.08%、38.38%和49.49%。筑波4号和筑波5号对发根土壤杆菌的抗性存在显著分离现象,可从中筛选出抗性极强的植株。     

A novel hierarchical framework to evaluate residential exposure to green spaces

Landscape Ecology - It has been widely acknowledged that exposure to green space (e-GS) has positive health benefits to urban residents. While most studies estimate e-GS from an availability or...     

A Method to Efficiently Apply a Biogeochemical Model to a Landscape

Biogeochemical models offer an important means of understanding carbon dynamics, but the computational complexity of many models means that modeling all grid cells on a large landscape is computationally burdensome. Because most biogeochemical models ignore adjacency effects between cells, however, a more efficient approach is possible. Recognizing that spatial variation in model outputs is solely a function of spatial variation in input driver variables such as climate, we developed a method to sample the model outputs in input variable space rather than geographic space, and to then use simple interpolation in input variable space to estimate values for the remainder of the landscape. We tested the method in a 100 km×260 km area of western Oregon, U.S.A. , comparing interpolated maps of net primary production (NPP) and net ecosystem production (NEP) with maps from an exhaustive, wall-to-wall run of the model. The interpolation method can match spatial patterns of model behavior well (correlations>0.8) using samples of only 5 t o 15% of the landscape. Compression of temporal variation in input drivers is a key step in the process, with choice of input variables for compression largely determining the upper bounds on the degree of match between interpolated and original maps. The method is applicable to any model that does not consider adjacency effects, and could free up computational expense for a variety of other computational burdens, including spatial sensitivity analyses, alternative scenario testing, or finer grain-size mapping.     

Relations of Phenolic Inhibitors to Resistance of Immature Apple Fruits to Rot

Extracts of phenolic compounds from maturing Red Delicious apple tissues containing p-coumaryl-quinic acids and chlorogenic acid were shown to be inhibitory to germination of Botrytis cinerea spores and mycelial growth of B. cinerea, Penicillium expansum and Alternaria sp. Measurements of the content of both acids during the growing season showed that the content of phenolic compounds was highest early in the season and decreased as the fruit matured. The decrease coincided with the rise in susceptibility of the fruit to rot caused by B. cinerea. The concentration of p-coumaryl-quinic acid was highest near the skin and lowest near the core.