假高梁再生3熟气象条件分析

根据全国气候温度带划分的气温指标，温州地区属中亚热带关型季风气候，温、光、水条件十分适宜假高梁的生长发育。连续２年的观察研究，它在１年内可以完成再生３熟。     

几种实验条件对蚁狮种群密度分布的影响

为了达到蚁狮的合理人工饲养，进行了不同饲食频率，不同饲养密度，不同沙粒粗细度三种条件各自对蚁狮种群密度分布的影响实验，结论是： １不同的饲食频率不影响蚁狮的种群密度分布，在经过几天调整后，其分布趋于稳定。其平均拥挤度２龄大于３龄。２加大幼虫密度对分布的影响表明，每头３龄幼虫适宜的占据面积为４０ｃｍ＾２左右，２龄为３０ｃｍ＾２左右。     

河西走廓日光温室可持续发展分析

人资源利用、环境保护、经济发展的角度，分析了河西走廓日光温室发展的利弊。结果表明：采用日光温室很好地提高了光、热、水以及土地资源的利用率，使至少３３％的太阳能从无效资源转变为有效资源，光温生产潜力提高２４５８５ｋｇ／ｈｍ＾２（蔬菜、玉米），增幅７５％；新增≥１０Ｃ积温３３６４．９Ｃ／ｄ，增幅１２３％，生长期 工一倍，水资源利用率提高一倍左右；土地单位面积产出提高１倍～２倍，对生态环境利大于。同时日     

黑绒金龟田间分布型及抽样技术初步研究

根据对西吉县１０块豌豆中黑绒金龟随机多点抽样调查的３年资料，配合Ｎｅｙ－ｍａｎ分布和负二项分布，发现该虫在豌豆田符合负二项分布，应用ＩｗａｏＸ－Ｘ回归法和Ｔａｙｌｏｒ指数法求得理论抽样量模型，从而导出不同置信度ｔ，不同虫中密度Ｘ（头／ｍ＾２）和不同允许误差Ｄ下的理论抽样数Ｎ。利用Ｉｗａｏ和Ｔａｙｌｏｒ序贯抽样模式，得到该虫的两个序贯抽样模型。结合Ｉｗａｏ和Ｔａｙｌｏｒ的二个模型，得到了该虫的复合序     

磷化铝对灰豆象的熏蒸处理试验

采用不同剂量的磷化铝,在不同处理时间,不同温度下对灰豆象进行熏节省,灰豆象对磷化铝水解后产生的磷化氢气体较敏感,耐药性较低。在３０℃以下,成虫０．１ｍｇ／Ｌ,３天或０．３ｍｇ／Ｌ,２天,卵０．１ｍｇ／Ｌ,３天或０．３ｍｇ／Ｌ,２天或０．５ｍｇ／Ｌ,１天,幼虫０．１／ｍｇ／Ｌ,４天或０．３ｍｇ／Ｌ,３天或０．５ｍｇ／Ｌ,２天;蛹０．１ｍｇ／Ｌ,５天或０．５ｍｇ／Ｌ,４天均可被杀死。在２９．５℃以上。     

麦草光防除麦田杂草试验总结

“麦草光”是一种内吸传导型选择性的苗后除草剂。为了明确该药剂对麦田杂草的防除效果 ,于２０００年１２月在道真自治县三江镇三江村杠上村民组进行了田间药效试验 ,现将试验结果总结如下 :１供试药剂１５ %噻磺隆可湿性粉剂（麦草光） ,通用名 :Ｔｈｉｆｅｎｓｕｒｏｎ -ｍｅｆｈｙｌ，由江苏省大丰市农药厂生产。２试验处理与设计２．１６６７ｍ２ 用１５ %麦草光粉剂１０ｇ和１５ｇ２．２６６７ｍ２ 用清水４０ｋｇ作对照２．３设置３个重复 ,重复间设保护行３试验方法３．１喷药时间在小麦４叶１心、杂草２～４叶进行施药。３．２施药…     

北疆棉花不同灌水量与棉田土壤水分研究

本文主要阐述了北疆内陆干旱棉区、棉花不同灌水量（６００ｍ３／ｈｍ２,１０５０ｍ３／ｈｍ２,１５００ｍ３／ｈｍ２）的棉田土壤水分,土壤水势变化规律,以及对棉花生长发育、生理生化指标与产量的影响。进一步为棉花生产提出最佳灌水指标。     

杏（Prunus armeniaca L.）的茎尖培养研究

９个杏品种的茎尖培养结果表明,初代培养基因ＭＳ＋０．２ｍｇ／ｌＫＴ＋０．２５ｍｇ／ｌ２,４,－Ｄ＋０．２５ｍｇ／ｌＮＡＡ＋３％蔗糖,增殖培养基为ＭＳ＋１．５ｍｇ／ｌＢＡ＋０．１ｍｇ／ｌＩＡＡ＋２．５％山梨醇,加长生长培养基为ＭＳ（１／２Ｎ）＋２．２ｍｇ／ｌＺＴ＋３％蔗糖,诱导生根培养基为１／２ＭＳ＋０．５ｍｇ／ｌＩＢＡ＋２％蔗糖,在相同培养条件下,不同品种的茎尖增重速率不同,从大到小依次为Ｔｙｒｎ     

水分胁迫下2,4—D和乙烯利对玉米幼苗光合特性的影响

在室内模拟田间干旱条件下，研究了２０ｍｇ／Ｌ２，４－Ｄ和４００ｍｇ／Ｌ乙烯利对室内盆栽玉米幼苗光全特性的影响。结果表明；随着胁迫时间的延长，各处理的净光合速率都有不同程度的降低。     

陕北丘陵沟壑区作物生产潜力与开发途径

通过分析陕北丘陵沟壑区自然资源，建立了作物潜力测算的数学模型，计算农作物光合，光温生产潜力分别为４２２１．６ｋｇ／亩和２１１４．９ｋｇ亩，并以小麦，玉米为例计算作物种植制度生产潜力分别为１２１８．８ｋｇ／亩和１２６８．８ｋｇ／亩；光，温，水生产潜力分别为１７９．４ｋｇ／亩和８２１．６ｋｇ／亩。与实际生产水平对比，各类耕地产量指数在０．８８－０．９８之间，针对影响粮食生产潜力的要因素，提出开发作物生     

棉花黄萎病的产量损失和模型建立

 通过田间小区接菌试验及统计分析表明:棉花黄萎病始花期的病情指数与棉花产量损失的相关性最强。在一定范围内种植密度愈高,群体间的补偿作用愈显著,适当密植是弥补损失的一项措施。还表明生病主要通过减少单株结铃数影响产量,绒长亦受到影响,而对单铃重、衣分影响不火。用多元回归法选取始花期病指(X₂)与密度(X₄),建立的产量损失预测式为:
L=1-exp[-exp(1.028LnX₂-0.000157X₄+0.9967)],r=0.8643,S_LX=0.079。     

芦笋茎枯病的换茎防病效果及产量效应

8月中下旬芦笋茎枯病严重发生时,利用芦笋有不断发新茎的习性,采用换茎防病措施,使芦笋茎枯病得到较好的控制。至10月中下旬,防病效果可达84.9％～98％,重病田换茎,翌年产量可增加70.1％～124％,芦笋长势好,茎数增加64.6％,生长系数增加103.7％,且有明显的增产后效应,至第3年,换茎仍比对照增产26.9％～48％,中度病田和轻病田换茎芦笋产量与对照无差异。     

THE EFFECTS OF SUB-LETHAL DOSES OF MCPA ON THE MORPHOLOGY AND YIELD OF VEGETABLE CROPS

Summary. The effect of sub-lethal doses of MCPA-sodium on the morphology, growth and yield of carrots and parsnips was studied in twenty replicated field experiments. Slight epinasty was produced in carrots by doses as low as 0.002 lb/ac a.e., but formative effects were not usually seen below 0.01 lb/ac. Crop weight was only reduced by doses greater than 0.1 lb/ac, but abnormalities rendered a proportion of the roots unmarketable at doses below 0.05 lb/ac. Small plants were sometimes killed by 0.3 lb/ac, but larger plants survived treatment with up to 0.5 lb/ac. Tests on carrots which were unmarketable on grounds of appearance failed to reveal any effect of MCPA on flavour, sweetness or texture of the roots. The effects of MCPA on parsnips were similar to those on carrots, but the expression of injury symptoms was generally less marked.
Les effets de doses sub-létales de MCPA sur la morphologie et le rendement des cultures légumières III. Carottes et panais     

夏玉米地杂草为害的产量损失模型

为了明确杂草在对杂草密度与夏玉米产量损失之间的函数关系的影响及反枝苋和马齿苋为害夏玉主的产理损失模型,在田间开展了此项研究。试验结果表明,反枝苋和马齿苋为害均不显著地影响夏玉米的籽粒得和单位面积穗数,造成夏玉米产量损失主要是通过降低每穗的籽粒数要草密度和夏玉米产量损失之间的函数关系因杂草种类不同而异,描述反枝苋密度和夏玉米产量损失之间的关系用双曲线优于Ｓ形曲线,而描述马齿苋密度和夏玉米产量损失之间     

THE EFFECTS OF SUB-LETHAL DOSES OF MCPA ON THE MORPHOLOGY AND YIELD OF VEGETABLE CROPS

Summary. The effect of sub-lethal doses of MCPA-sodium on the growth, yield and marketability of summer cabbage lettuce was studied in seventeen replicated field experiments.
Initial epinasty was produced by doses as low as 0.002 lb/ac a.e., and formative effects of the leaves developed at doses below 0.01 lb/ac. In plants treated at early or intermediate growth stages, two distinct types of formative effects occurred, With doses in the range 0.0025-0.03 lb/ac, a zone of characteristic abnormal leaves developed. This reduced the marketability of the crop and the maturity was delayed, but the weight per plant at harvest was not affected. At higher doses these a abnormal leaves were not evident but the whole plant became distorted, growth was suppressed and few marketable plants were produced. In plants treated at the hearting stage, plant weight and maturity were not affected, but the marketability was reduced at doses of 0.01 lb/ac and above. The effects produced by MCPA in cos and curly crisp lettuce were compared with those produced in cabbage lettuce.     

THE EFFECTS OF SUB-LETHAL DOSES OF MCPA ON THE MORPHOLOGY AND YIELD OF VEGETABLECROPS

Summary. The effects of sub-lethal doses of MCPA-sodium on the morphology and yield of red beet, turnip and onion and on the morphology of spinach were studied in field and glasshouse experiments. Epinastic responses of beet were seen at 0.003 lb/ac a.c., but no serious formative effects or yield reductions occurred below 0–07 lb/ac and plants were only killed by doses above 0–1 lb/ac. Spinach was affected at 0–06 lb/ac, the lowest dose used, but the plants were not killed at 0–33 lb/ac. Epinasty in turnip occurred at 0–002 lb/ac, and at 0–01 lb/ac many of the roots were abnormal, while spraying with 0–1 lb/ac and above resulted in severe distortion or death of the plants. Onion was the least affected of all the crops studied. When a welting agent was included in the spray epinasty occurred at 0–3 lb/ac, but there were no serious formative effects or yield reductions below 1–0 lb/ac. The symptoms of injury in onion were often transitory because the affected parts were replaced as the bulb developed.
Effets de doses sub-léthatles de MCPA sur la morphologie et If rendement des cultures légumiéres. V. Betteraves, Epinards, Navets et Oignons     

THE EFFECTS OF SUB-LETHAL DOSES OF MCPA ON THE MORPHOLOGY AND YIELD OF VEGETABLE CROPS

Summary. The effects of sub-lethal doses of MCPA-sodium on the morphology, yield and marketability of cabbage, cauliflower and Brussels sprouts were studied in field and glasshouse experiments. The epinastic and formative effects in all three crops were similar. Cauliflower was the most susceptible and cabbage the least, but the marketability of these two crops was adversely affected at lower doses (less than 0.06 lb/ac a.e.) than that of Brussels sprouts (not below 0.1 Ib/ac a.e.), where the damage to the apex had less effect on the economically important portion of the plant. Brussels sprouts also produced lateral shoots on which normal sprouts developed even when the main stem above had been killed. In all three crops, characteristic galls were produced on the stems, and these, together with the effects on the stem apices, the leaves and the roots, are described and contrasted with abnormalities caused by other agencies.
Effets de doses sub-létales de MCPA sur la morphologie et le rendement des cultures tégumières IL Choux, choux-fleurs et choux de Bruxelles     

棉花黄萎病产量损失及补偿作用研究

 试验结果表明,棉花黄萎病群体损失,病指为5.0-53.0时,皮棉损失率为7.60-38.53%.     

THE EFFECTS OF SUB-LETHAL DOSES OF MCPA ON THE MORPHOLOGY AND YIELD OF VEGETABLE CROPS

Summary. The effects of sub-lethal doses of MCPA-sodium on the morphology, yield and maturity of French beans, and on the morphology of broad beans, were studied in field and glasshouse experiments. Epinasty in French beans developed at 0.002 lb/ac a.e., but formative effects were not seen at less than 0–1 lb/ac. With doses up to 0.4 lb/ac there was no significant reduction in yield or haulm weight, but at 1.0 lb/ac and above, yield was reduced and some of the plants sprayed at an early stage of growth were killed. There were characteristic modifications of the roots and stems and of those leaves which were at a susceptible stage of development when sprayed. Broad beans were only slightly injured by 0.2 lb/ac but were generally killed by 2.0 lb/ac. Abnormalities were noted in the germination of seed produced by affected plants.
Effets de doses sub-léthales de MCPA sur la morphologic et le rendement des cultures légumières IV. Haricots verts et fèves     

水稻品种间纹枯病的严重度与产量损失的关系

在田间人工接种条件下,比较江苏省10个水稻生产品种的纹枯病发病程度及其产量损失率。结果表明:水稻品种间的发病程度和产量损失率均有明显差异。增施氮肥后纹枯病的严重度增加,但对产量的影响则因品种而异。在按株测定7个水稻生产品种的病害严重度与产量损失的关系中获知:用来衡量病害严重度的病级(病斑高度)与产量损失之间有十分密切的关系,从而建立了病级(x)与产量损失率(y)之间的回归方程:y=4.487x-1.416。