Because of the exotic weeds with strong reproductive capacity, adaptability and adversity-resistance, and short of strong competitive plants and natural enemies in the local area the exotic weeds such as Aiternanthera philoxeroides, Eichhornia crassipes, Ageratina adenophorun and Ageratum conyzoides etc.

由于農(nóng)林牧漁業(yè)生產(chǎn)、綠化美化等目的有意引進jiujiure精品；或旅游114一级黄片、交通工具等無意引入；或自身擴散傳播的自然入侵人人操操操操操操操操操操，外來植物一旦逃逸人為控制進入自然生態(tài)系統(tǒng)并能自行繁殖和擴散在线免费AV，形成野化種群，變成外來入侵植物中文字幕在线视频永久无码免费视频，成為危害農(nóng)牧業(yè)生產(chǎn)和破壞生態(tài)環(huán)境的有害雜草欧美性三级视频。

The problem of weeds can be regarded as resolved, but new problems may come, every time I remove the weeds, that they will see a black insect flying in Alocasia, at first I did not care, can be subsequently leaves have been eating a hole, I was concerned about the effect of this phenomenon, on the show from home mosquito control agent, spray several times, it really is effective!

雜草的問題算是解決了，可新的問題卻又來了欧美日韩性爱网络，每次我除去雜草的時候亚洲978eee，都會看到有黑色的小蟲在觀音蓮上飛，起初我并沒有在意99视屏在线，可后來葉子上都被啃出了小洞欧美最新视频，我才關(guān)注起了這個現(xiàn)象，就從家里拿出滅蚊劑国产精华Av在线导航网站，噴了幾次欧美第一页激情视频，還真是有效果呢！

There were over 20 species of grass weeds, and over 30 species of broadleaf weeds in 15 families.

結(jié)果顯示：該市麥田主要禾本科雜草超過20種国产人与动人物a级毛片，主要闊葉雜草有15科30種以上欧美曰韩亚洲视品。

Deep plowing before planting alfalfa can effectively prevent the use of horsetail, reeds, weeds such as Convolvulus arvensis hazards, but also advance the adoption of tillage-induced seed germination of weeds, through the laundry and other measures to suppress the emergence of weeds.

苜蓿播種前采用深耕能有效防止問荊、蘆葦欧美xxxxwwww、田旋花等雜草的危害又粗又长又色又爽视频，通過翻耕還能提早誘發(fā)雜草種子的萌發(fā)，通過晾曬等措施能抑制雜草的出苗三级电影网址。

Result In peanut seedling stage, spraying 900 ml/hm^2 quizalofop-P-ethyl EC on the grass weeds such as Barnyard grass, Green bristlegrass and Goosegrass had 100% control effect, but it had a poor control effect on some broad-leaved weeds. While, spraying 600 and 720 ml/hm^2 quizalofop-p-ethyllactuofen EC had remarkable effects not only on the grass weeds such as B. grass but also on the broad-leaved weeds such as Purslane, Cirsium setosum and Dayflower, with the control effect of more than 80%. Both of the 2 herbicides would not produce some slight contact drug spots on the part of peanut leaves and the drug spots on the leaves could be recovered in 1 to 2 weeks, which couldn't affect the growth and yield of the peanut in middle and late stage. So the 2 herbicides had good selectivity.

結(jié)果］在花生苗期噴施900 ml/hm^2精喹禾靈乳油對稗草男女猛烈无遮挡免费视频滚床、狗尾草、牛筋草等禾本科雜草具有100%的防效自拍偷拍网页，但對一些闊葉雜草防效較差欧美国产综合操逼视频，而噴施600和720 ml/hm^2精喹乳氟禾乳油則除了對稗草等禾本科雜草有特效外，還對馬齒莧三级黄毛、刺兒菜先锋影音最新资源网站、鴨跖草等闊葉雜草具有顯著的防效69毛片免费视频观看，均達80%以上。2種除草劑均對花生葉片局部產(chǎn)生一些輕度的接觸性藥斑av网站在线管看，藥斑在12周內(nèi)可恢復国产丝袜福利在线，不影響花生的中后期生長及產(chǎn)量，具有很強的選擇性少妇高潮太爽了在线观看。

Benzoxazine compounds are one kind of highly active protoporhyrinogen oxidase inhibitors. These compounds can effectively control both monocotyledon weeds and dicotyledon weeds at lower dosage. The action mechanism is similar to p-nitro-o-substituted diphenylethers. They can result weeds albinism and decolorization, which are very important albinism herbicide.

苯并噁嗪類化合物是一類高活性的原卟啉原氧化酶抑制劑自拍偷拍毛片，低劑量可有效地防除禾本科與闊葉雜草，其作用機理和對硝基鄰位取代的二苯醚類似国产美女激情视频，它們造成白化或脫色QVOD经典激情视频图片小说，是白化除草劑中較重要的種類，其活性遠超過二苯醚除草劑国产一级A片免费视频在线观看，是目前化學農(nóng)藥研究領(lǐng)域的熱點超碰在线免费。

The xeromorph weeds are the most damage weeds to rice during the first fastigium,while the water weeds are dorminant types in the second fastigium.

近些年北方地區(qū)常年出現(xiàn)季節(jié)性干旱，導致水稻生產(chǎn)不穩(wěn)定www.se视频，有些年份個別地區(qū)甚至導致水田棄耕九一视频在线下载。

The distribution and harm of species of dominant weeds of lawn vary with different area, and the most harmful weeds belong 8 families, which were Poaceae, Asteraceae, Cyperaceae , Amaranthaceae, Euphorbiaceae, Polygonaceae, Fabaceae and Caryophyllaceae, about accounted for from sixty percent to seventy percent in all weeds in lawn.

摘要不同地區(qū)草坪優(yōu)勢雜草的種類不盡相同，禾本科十八以下禁止观看的网站、菊科能看的黄色网站网址、莎草科、莧科欧美黑人大尺度又粗又长最新章节、大戟科国产女主播精品在线播放、蓼科、豆科和石竹科等8個科的雜草種類和發(fā)生數(shù)量最多亚洲中文字幕久久精品，約占雜草總數(shù)的60%~70%黄色视频免费观看91。

Using nuclear DNA C-values for 539 angiosperms in China, we examined the variation of these values among growth forms and taxonomic groups and the relationship of these values with invasiveness. Mean DNA C-value of the 539 angiosperm species was 4.06 pg. Mean DNA C-value was(1) significantly lower for woody species (1.84 pg) than for herbaceous species(5.02 pg);(2) significantly lower for 360 dicots (2.20 pg) than for 179 monocots (7.80 pg);(3) significantly lower for annuals (2.78 pg) than for perennials(6.65 pg);(4) significantly lower for 134 weed species (1.93 pg) than for herbaceous non-weeds (6.75 pg) and for several families that have an unusually high proportion of weed species;(5) significantly lower for 47 exotic weed species (1.76 pg) than for 134 native weeds (1.93 pg), but significantly lower than that of "non-weedy" herbaceous species (6.75 pg);(6) lower for weeds than for "non-weedy" species in same genus or family; and (7) in herbaceous species, generally lower for weedy compared to "non-weedy" species, with some exceptions such as Avena fatua, whose DNA C-value is as high as 14.15 pg, contrarily, and some "non-weedy" herbaceous species in Cruciferae and Cucurbitaceae with very low values.

統(tǒng)計了中國境內(nèi)有分布的539種被子植物的DNA C-值，分析了它們在不同分類群免费一级日本大片、生活型日逼小黄片、倍性、生活史類型以及在雜草和非雜草類群中的分布情況超级毛片网址在线观看，主要結(jié)果如下：(1)539種被子植物DNA C-值平均為4.06 pg一级黄色AAA性爱片，其中木本植物的DNA C-值平均為1.84 pg，低于草本植物的平均值(5.02 pg)在线黄片免费观看；(2)雙子葉植物(360種)的DNA C-值平均為2.20 pg97无码免费公开在线视频，極明顯地小于單子葉植物(179種)的平均值(7.80 pg)；(3)1年生植物的DNA C-值平均為2.78 pg在线观看韩国免费A∨网站，明顯小于多年植物的平均DNA C-值(6.65 pg)自拍亚洲国产；(4)134種雜草的DNA C-值平均為1.93 pg久章草在线精品视频欧美九狼，明顯小于非雜草草本植物的平均值(6.75 pg)国产原创激情在线观看网站免费下载，含雜草較多的科一级毛片无码不卡直接观看，平均DNA C-值相對較小台湾特级黄片；(5)統(tǒng)計的47種入侵雜草的DNA C-值平均為1.76 pg久艹自拍偷拍，略小于134種雜草的平均DNA C-值(1.93 pg)，極顯著地小于非雜草性草本植物(6.75 pg)黄色十黄片；(6)以科為單位AV天堂永久网，不同科的DNA C-值存在著極大的差異；(7)DNA C-值與染色體倍性的關(guān)系并不明顯国产精品视频免费视频看看，但是性爱日韩一区，隨著倍性的增加，基因組變腥镀珹片一级毛片视频「咔逦蘼胄园悠翟谙吖劭矗?8)在同一科、屬中在线观看黄色视频一站，與非雜草相比一级做a爰片久久毛片A片高潮，典型雜草的DNA C-值往往偏小日本男人插女人；(9)總體上雜草或雜草性強的植物日韩精品合集第一页免费观看，它們的DNA C-值比非雜草性植物的要小。

Tepraloxydim can kill Gramineae weeds effectively, and it can be applied to all the weeds' generational period especially in 3-5 leaf periods in Gramineae weeds.

快捕凈對禾本科雜草有較好的殺草活性清清草影院欧美日韩，可以適用于雜草的整個生育期a片黄片黄片大黄片黄片，在禾本科雜草的3-5葉期使用效果最好。