The proportion of organic fertilizer in total nutrient inputs had being decreased with time, 2 the recycling ratio of nutrient of organic fertilizer was low, the regional application of organic fertilizer was imbalanced, and 3 over-application of organic fertilizer lead to nitrate pollution of groundwater and heavy metal accumulation in soil.

我國有機(jī)肥料利用中存在的主要問題是：①有機(jī)肥施用面積逐年減少污污污视频网站色，肥料結(jié)構(gòu)中有機(jī)肥的比重逐年降低，但近年來趨于平穩(wěn)欧美性爱视频免费在线看；②有機(jī)肥養(yǎng)分再循環(huán)率不高日韩欧美一级特黄AAAAA片，區(qū)域利用狀況不平衡；③有機(jī)肥過量施用帶來的一些環(huán)境問題如地下水資源污染亚洲精品自拍私拍、土壤重金屬累積等97精品视频在线观看免费专区。

Based on the facts of low soil fertility and unbalanced nutrient ratio in Ankou valley ,one soil sample was collected per 2 to 3 hm 2 according to the land use pattern and the relief determinant .

針對(duì)安口流域內(nèi)土壤肥力水平低且養(yǎng)分比例失調(diào)的實(shí)際狀況，按土地利用方式及地形部位每 2～ 3hm2 面積采集一個(gè)土壤樣品国内嫖妓无码视频在线观看，用常規(guī)分析方法測定了土壤有機(jī)質(zhì)午夜福利A片1000无码免费、有效氮、有效磷九一视频在线下载、有效鉀欧美国产综合在线、有效銅、有效鋅等養(yǎng)分指標(biāo)能看的黄色网站网址，編制了土壤養(yǎng)分豐缺對(duì)照表黄软件在线观看，對(duì)各測定項(xiàng)目進(jìn)行了系統(tǒng)評(píng)價(jià)，并作了相應(yīng)的推薦施肥建

The dormant buds got the nutrient'ratio that roots of main crop and new roots of epigynous bud absorbed and the photosynthate the leaves made during main crop maturing were different, therefore, the spikelet number of panicle came from different nodetbud were different.

生育期上位芽穗較下位芽穗短国产女主播精品在线播放，頭季稻根系和低位芽發(fā)生的新根吸收的養(yǎng)份无码全黄性涩视频在线，以及頭季稻后期功能葉制造的光合產(chǎn)物分配到不同節(jié)位芽比例不同，因而不同節(jié)位芽成穗的大小不同黄色视频免费观看91。

Nutrient ratio is comprehensive and reasonable.

營養(yǎng)配比是否全面合理欧美AA欧美A。

Furthermore, as predicted, we observed a decline in seston C : P as the light : nutrient ratio declined, but seston C : N simultaneously increased.

此外，正如預(yù)測日逼小黄片，我們觀察到一個(gè)降低在顆粒 C ： P 作為光線與營養(yǎng)比率下降一级a片啊啊啊，但是顆粒 C ： N 同步地增長。

This counterintuitive 'more organic carbon gives less organic carbon' effect was particularly pronounced in diatom-dominated systems where the carbon/mineral nutrient ratio in phytoplankton production was high.

這一結(jié)果凸現(xiàn)了這樣一個(gè)關(guān)系，即對(duì)海洋碳循環(huán)當(dāng)前和未來狀態(tài)的描述国产激情av在线，怎樣依賴于對(duì)海洋食物鏈內(nèi)的碳與限制生長的礦物營養(yǎng)之間的化學(xué)計(jì)量耦合的認(rèn)識(shí)在线黄片免费观看。

Within a short time span of just over 40 years China has developed from an insignificant to the world's largest and still fastest growing producer and user of chemical nitrogen fertilizer. Unfortunately China is now also the country with the most unbalanced nutrient ratio. If continued into the future, the grave nutrient imbalance that prevails at present threatens the fertility of China's soils that has been maintained so well over the centuries, thereby also threatening, sustainable agriculture.

僅40多年時(shí)間里中國就從世界上微不足道的氮肥使用國發(fā)展成為最大的、而且增長速度最快的氮肥生產(chǎn)和使用國美女下部隐私扒开视频无遮挡，令人遺憾的是中國是世界氮久草视频在线一区二区三区、磷、鉀使用最不平衡的國家玖玖色在线免费视频，如果任憑這種趨勢(shì)繼續(xù)下去8x8ⅹcom永久免费视频，將勢(shì)必對(duì)數(shù)千年來我們祖先一直維持良好的地力造成威脅，由此也對(duì)農(nóng)業(yè)持續(xù)發(fā)展帶來威脅色色综合电影网站。

Granule organic compound fertilizer had the advantages of nutrient equilibrium, conjunction of organic and inorganic nutrient and high nutrient utilization ratio, which made its application increase sharply in recent years.

顆辆镁面面霉槎?1天堂；袡C(jī)復(fù)混肥具有養(yǎng)分均衡、有機(jī)無機(jī)配合国产欧美色,一区二区三区、使用方便黄色十黄片、養(yǎng)分利用效率較高等優(yōu)點(diǎn)，近年來發(fā)展迅速亚洲va国产日韩欧美精品色婷婷。

The changes of nutrient in sweet pepper leaf at bud and at full fruit stage were different and the change of nutrient ratio (N/P, N/K, K/P) was smaller at bud stage than at full fruit stage, which was better stage for nutrition diagnosis.

甜椒花蕾期和盛果期葉片養(yǎng)分變化規(guī)律不盡相同国产精品视频免费视频看看，葉片養(yǎng)分比例N/P、N/K草国产在线视频、K/P以花蕾期變化小于盛果期三级片A片一级毛片视频，為甜椒適宜營養(yǎng)診斷期。

The results showed that 1518kg farmyard manure and 59.9kg chemical fertilizer, equal to 38kg N, P and K pure nutrient, were applied per unit area (667m2) of arable land,and that the nutrient ratio of farmyard manure and chemical fertilizer was 4.9∶5.1 (N∶P2O5∶K2O=1∶0.4∶0.62), and that the total complex grain output per year and the complex output value were 479.6kg and 804.47yuan per 667m2 respectively, and that the manure cost and the pure income from manuring were 148.25 yuan and 716.22 yuan per 667m2 respsctively, and that 12.6kg grain output could be gotten averagely from 1kg nutrient input The main factors affected the manuring effect were topography, cropping systems and crops kinds and manuring quantity from a peasant household as well effected the soil fertility significantly.

結(jié)果：平均每667m2耕地投入農(nóng)家肥1 518 kg亚洲色图熟熟，化肥59.9 kg在线观看黄色视频一站，折氮磷鉀純養(yǎng)分38 kg，農(nóng)家肥與化肥養(yǎng)分比為4.9∶5.1欧美熟妇性爱A片在线A片视频，N∶P2O5∶K2O=1∶0.4∶0.62日本男人插女人，全年糧食復(fù)合單產(chǎn)479.6 kg/667m2，復(fù)合產(chǎn)值864.47元毛茸茸婊子，肥料成本148.25元/667m2清清草影院欧美日韩，肥料純收入716.22元，肥料產(chǎn)投比值5.9欧美黄色性交一级大屏，投入1 kg養(yǎng)分產(chǎn)糧12.6 kg欧美在线视频播放。影響投肥效應(yīng)的主要因素為地勢(shì)、耕制和作物呦呦网址。農(nóng)戶投肥數(shù)量對(duì)土壤肥力影響較大美女黄色被插视频。