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1.
在北京、烟台地区大田条件下研究了夏玉米田杂草治理的生态经济阈值,建立了夏玉米产量损失 率与杂草密度的关系。结果表明,杂草与夏玉米的竞争随其密度增加而加剧,夏玉米产量逐渐下降,当杂草密度达到200株/m2时,夏玉米产量损失率达53.07%。华北地区夏玉米田杂草治理的生态经济阈值为4.21～6.91株/m2,即当杂草密度低于生态经济阈值时,对玉米产量的影响很小,可任其生长;高于生态经济阈值时则应及时有效地防治。 相似文献
2.
华北地区夏玉米田杂草防治的生态观点 总被引：1，自引：0，他引：1
在北京,烟台地区大田条件下研究了夏玉米田杂草治疗的生态经济阈值,建立了夏玉米产量损失率与杂草密度的关系。结果表明,杂草与夏玉米的竞争随其密度增加而加剧,夏玉米产量逐渐下降,当杂草密度达到２００株／ｍ＾２时,夏玉米产量损失率达５３．０７％。华北地区夏玉米田杂草治理的生态经济阈值为４．２１－６．９１株／ｍ＾２,即当杂草密度低于生态经济阈值时,对玉米产量的影响很小,可任其生长,高于生态经济阈值时则应及时 相似文献
3.
不同耕作、秸秆及氮素管理措施对冬小麦-夏玉米轮作田杂草生物量影响的研究 总被引：1，自引：0，他引：1
农田杂草的发生受多种生产措施的影响,是造成作物减产的重要原因之一。本研究目的在于探索我国华北平原冬小麦-夏玉米轮作体系下农田杂草对不同耕作、秸秆和氮管理的响应。研究结果发现:(1)夏玉米拔节期杂草种类和平均总生物量分别是冬小麦拔节期的1.25倍和6.66倍,因此,玉米季是轮作中农田杂草防治最主要季节,而马唐、打碗花、稗草等是杂草防治的主要对象。(2)不同管理措施对冬小麦季农田杂草生物量无显著影响。(3)夏玉米季,全免耕处理杂草平均生物量比半免耕处理高77.5%～99.4%。玉米拔节期,无小麦秸秆覆盖还田时,会促进翻耕杂草的发生。(4)夏玉米收获时,高氮水平(当季施氮量240 kg.hm-2)杂草平均生物量比低氮水平(当季施氮量120 kg.hm-2)显著低55.9%,耕作和氮效应的交互作用达显著水平,全免耕、低氮投入杂草生物量是半免耕、高氮投入的4.05倍,在翻耕条件下,高氮水平抑制杂草效果不显著。因此,华北平原区冬小麦-夏玉米轮作体系应加强夏玉米季杂草的综合防治,利用秸秆覆盖还田抑制杂草的发生,也可通过优化氮素管理改善作物生长发育从而抑制杂草发生,其中在全免耕条件下,可通过适当增加氮素供应水平而减轻杂草的危害。 相似文献
4.
本文利用涡度相关技术对青岛农业大学现代农业科技示范园试验站2013—2014年冬小麦/夏玉米轮作田与大气之间CO_2、水汽和能量交换进行测量,分别对潜热和CO_2通量进行两种密度修正(WPL修正和Liu修正)并进行对比,计算了两种密度修正前后冬小麦/夏玉米轮作田的能量闭合度。结果表明:WPL修正与Liu修正可以提高潜热通量,WPL修正后夏玉米田潜热通量约提高6%,冬小麦田约提高2%;Liu修正后夏玉米田提高不足1%,冬小麦田提高约2%。因此WPL修正对于夏玉米田潜热的修正效果明显优于Liu修正,而对冬小麦田潜热修正两种方法效果相同。两种修正方法对于CO_2通量具有降低的修正效果,WPL修正后夏玉米田和冬小麦田CO_2通量分别降低3%和4%;Liu修正后夏玉米田和冬小麦田CO_2分别降低2%和3%。可以看出,WPL修正和Liu修正对CO_2通量修正前后差别非常小(差距均为1%)。通过对青岛地区冬小麦/夏玉米轮作田能量闭合度的分析,发现密度修正可以提高能量闭合度,但不同下垫面有不同的修正效果。裸地情况下,WPL修正可以提高能量闭合度约2.53%~9.76%,夏玉米田为4.05%,冬小麦田为1.35%;而Liu修正对裸地能量闭合度的提高小于2.53%,对夏玉米田和冬小麦田提高约为1.35%。显然WPL修正对于能量闭合度的修正幅度大于Liu修正。能量闭合度大小关系为裸地Ⅰ(夏玉米出苗前)裸地Ⅱ(冬小麦出苗前)夏玉米田冬小麦田。 相似文献
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深松一体化播种对夏玉米农田土壤水热特征及微生物动态的影响 总被引：8，自引：1，他引：8
为明确深松一体化播种下海河低平原区夏玉米农田土壤水热特性和微生物动态变化,于2012—2013年在河北省农林科学院旱作农业研究所深州试验站,以玉米品种‘郑单958’为试验材料,设置夏玉米深松一体化播种和免耕播种两个处理,从玉米出苗开始,根据生育进程定期测定农田土壤水热特性和微生物状况。结果表明,深松一体化播种处理可提高土壤温度,并扩大温度日较差,玉米全生育期深松一体化播种处理比免耕播种处理土壤温度平均提高1.5%。免耕播种处理有利于表层土壤水分储蓄,而深松一体化播种处理有利于深层土壤水分储蓄。其中,在0~20 cm土层,免耕播种处理比深松一体化播种处理土壤含水量高17.5%;在40~100 cm土层,深松一体化播种处理比免耕播种处理含水量则提高9.2%。在0~40 cm土层中,深松一体化播种处理土壤中真菌数量、细菌数量、土壤微生物量碳和土壤有机碳含量2年平均分别增加26.8%、17.5%、23.5%和57.8%,均显著高于免耕播种处理;放线菌减少18.62%,显著低于免耕播种处理。整体来看,深松一体化播种可促进玉米农田真菌数量、细菌数量、土壤微生物量碳和土壤有机碳含量的增加,扩大土壤温度日较差,提高了土壤对水分的储蓄能力。这对改善海河低平原区夏玉米农田生产力,促进农田可持续利用,提高作物产量具有积极意义。 相似文献
6.
千金子和异型莎草均是直播稻田的恶性杂草,危害水稻的生长发育,对水稻生产造成严重威胁。为明确千金子和异型莎草对直播稻产量的影响及其生态经济阈值,采用添加系列试验法和模型拟合法研究不同密度千金子和异型莎草组合和与水稻不同共生时间下水稻产量性状的变化规律。结果表明,随着千金子和异型莎草组合密度增加以及与水稻共生时间延长,水稻的有效穗数、每穗实粒数、千粒重和产量均逐渐下降。当千金子+异型莎草密度增加至8株·m~(-2)+8株·m~(-2),水稻产量仅2 236.37kg·hm~(-2),与空白对照相比产量损失率为71.14%;在千金子4.67株·m~(-2)+异型莎草3.50株·m~(-2)的平均密度下,二者与水稻在整个生育期共生时,水稻产量为5 138.33 kg·hm~(-2),与空白对照相比产量损失率为33.37%。低密度、短时间共生的两杂草组合对水稻产量无显著影响。但从密度梯度看,在两种杂草与水稻整个生育期共生条件下,杂草复合密度达到4.14株·m~(-2)时,则必须对其进行防除;从共生时间的尺度看,在试验设置密度条件下,必须在水稻种植后的16.7 d进行杂草防除,否则将对水稻产量和经济效益造成显著影响。在对复合杂草生态经济阈值分析的基础上进行杂草防除,可避免除草剂盲目使用,对减少除草剂使用次数,降低除草剂用量、节约除草成本和保护农田生态环境具有指导作用。 相似文献
7.
试验分析了5种免耕播种夏玉米施肥方式对植株体内叶绿素含量、植株形态构成、产量及其形成相关因素的影响。结果表明,不等距间施肥方式效果最好,叶绿素含量达3.94mg/g,不同时期叶面积均最高,有利于全苗壮苗,增强抗旱能力,夏玉米产量最高达7646.3kg/hm2,增产幅度为35.23%。 相似文献
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9.
耕作措施对土壤特性及作物产量的影响 总被引：68，自引：9，他引：59
通过夏玉米田间试验研究了不同耕作措施及秸秆覆盖对土壤特性、水分状况、作物产量及水分利用效率的影响。试验处理包括常规耕作、深松、秸秆覆盖、垄作、浅坑及免耕。结果表明,秸秆覆盖可显著提高土壤蓄水量、作物产量及水分利用效率。其保水增产效果在干旱年份更加明显。深松可有效打破犁底层降低其密度,可增加作物根深、根长及根重,提高作物产量和水分利用效率。免耕可提高夏玉米早期田间土壤含水率,保持相同产量。 相似文献
10.
河北低平原区冬小麦夏玉米产量提升的理论与技术研究 总被引：3，自引：1，他引：2
作为渤海粮仓主要增粮区的河北东部低平原中低产农田,冬小麦夏玉米的产量主要受制于土壤肥力水平低、淡水资源短缺和气候异常造成产量的大幅波动。通过选择适宜的品种、播期与收获期的合理搭配、优化的种植方式和配套的耕作与田间管理技术,提高作物生育期内对地上光热资源和地下水肥资源的利用潜力和效率,平抑气候变化带来不利影响,有着巨大的增产空间。该研究通过田间小区试验,结合示范区试验示范,研究了冬小麦与夏玉米生育期的优化、夏玉米种植方式调整、夏玉米深松播种、夏玉米增施钾肥与冬小麦增施磷肥及有机肥等措施对冬小麦、夏玉米产量的影响。主要研究结果如下:冬小麦适期晚播(不迟于10月15日),同时适当增加播量,不影响生育期群体构建和产量水平。早熟品种‘小偃81’提早进入灌浆期,受后期干热风的危害小,在不降低品质的同时粒重与产量稳定。夏玉米提早播10 d(6月10日与6月20日相比)平均增产17.2%,晚收获8 d(10月2日与9月24日相比)粒重增加19.5%。根据冬小麦和夏玉米的品种特性,合理搭配生育期,在实现冬小麦稳产提质的同时,使充分发挥夏玉米的产量潜力成为可能。改变夏玉米的种植方式,适当增加种植密度,明显地改善和提高了夏玉米产量,更为适宜的种植方式是40 cm与80 cm大小行种植和38 cm等行距种植,不适宜的是20 cm与100 cm大小行种植,更为适宜的种植方式下产量提高15%以上。长期旋耕机械压实了犁底层,通过夏玉米深松播种种植,产量提高达31.3%,后茬小麦增产5.6%,但连续深松没有明显的增产效果。夏玉米播种时增施钾肥产量提高2.6%。冬小麦增施磷肥产量提高7.4%,增施有机底肥增产6.8%,增施有机底肥和施磷肥产量提高8.8%,但无明显的累加效果。因此,通过适宜的品种选择与适期的生育期搭配、种植方式调整、适时深松打破犁底层的耕作措施、速效肥与有机肥合理施用等栽培和管理技术,可实现冬小麦夏玉米产量的逐步提高和稳定,充分利用玉米生长季丰富且集中的降水与光热资源,挖掘夏玉米产量,稳夏增秋的粮食增产模式更符合该地区未来发展需求。 相似文献
11.
湖北省水稻主产区稻田杂草种类及群落特点 总被引：11，自引：2，他引：9
采用七级目测法调查了湖北省3个水稻主产区25个样点稻田杂草的种类及危害程度,分析了各水稻主产区稻田杂草群落的特点.结果表明,湖北省水稻主产区稻田杂草有23科43种,据综合草害指数优势种杂草依次为稗、双穗雀稗、水花生、鸭舌草、千金子、丁香蓼、鳢肠、浮萍.其中襄樊－随州地区以稗、水花生为优势种类,江汉平原以稗、双穗雀稗为优势种类,黄冈地区以稗、鸭舌草为优势种类.江汉平原与黄冈地区稻田杂草群落相似性较大,Sфrenson相似性指数为0.774 1,二者均与襄樊－随州地区的相似性较小.总体上看,湖北省水稻主产区稻田杂草的丰富度较低,可能与长期施用除草剂有关. 相似文献
12.
Amir Hooshang Jalali Foroud Salehi Mohammad Jafar Bahrani 《Archives of Agronomy and Soil Science》2013,59(11):1261-1269
A two-year (2008–2009) field experiment was conducted to determine the effect of irrigation management and weed control on yield and yield components of safflower. The experiment was conducted as a split-split plot arranged in a randomized blocks design with three replications. There were two treatments (weedy and weed free) and four irrigation interval water managements (7 days for all stages, 15, 22 and 28 days after six-leaf stages). The results indicated that grain yield was 29% higher in weed-free plots than in weedy plots. Weed competition reduced yield components such as primary branches, petal weight and number of capitulum per plant. Increasing the irrigation interval to 15 days at the six-leaf stage had no significant effects on grain yield, but grain yield decreased by 18 and 29.8% with increases in the irrigation interval to 22 and 28 days, respectively. An increased irrigation interval >15 days had negative effects on yield components like number of capitulum per plant, petal weight and number of primary branches. The highest grain yield (3703 kg ha?1) was obtained in the weed-free plot, and there was no significant difference between 7- and 15-day irrigation intervals. 相似文献
13.
淹灌和间歇灌溉对晚稻田杂草群落多样性的影响 总被引：3，自引：1，他引：3
为探明节水灌溉对稻田杂草群落组成及物种多样性的影响,运用群落生态学方法,开展了淹灌与间歇灌溉2种灌溉模式下水稻不同生育阶段稻田杂草群落动态变化研究。结果表明:间歇灌溉和淹灌稻田杂草种类分别有10科13属14种、10科11属11种;间歇灌溉稻田各生育期杂草密度平均降低27.8%;优势杂草种类虽与淹灌基本一致,但阔叶类杂草矮慈姑重要值降低9.76%,单子叶杂草浮萍重要值降低65.38%;间歇灌溉稻田以旱生杂草生长为主,总体各生育期旱生杂草群落密度增加277.51%,水生杂草群落密度降低81.44%,而淹灌稻田以水生杂草为主;间歇灌溉稻田Margalef物种丰富度指数、Shannon-Wienner多样性指数、Simpson优势度指数和Pielou均匀度指数,平均提高27.01%、14.31%、9.09%和3.48%,乳熟期差异尤为显著。间歇灌溉提高了稻田杂草多样性,有效地抑制了优势种杂草生长,有利于改善稻田生态保护。该研究可为节水灌溉稻田杂草控制及多样性保护提供科学依据。 相似文献
14.
Weed growth and crop yield responses to tillage and mulching under different crop rotation sequences in semi‐arid conditions 
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下载免费PDF全文 N. Mashingaidze S. Twomlow I.C. Madakadze W. Mupangwa Z. Mavunganidze 《Soil Use and Management》2017,33(2):311-327
Conservation agriculture (CA) is thought to reduce weed pressure from the third year of adoption, when recommended practices are followed. Weed growth and crop yield were assessed during the third and fourth year of maize–cowpea–sorghum rotation, second and third year of maize–cowpea rotation and first and second year of maize monocropping on a clay loam soil at Matopos Research Station (annual rainfall, 573 mm) following recommended CA management practices. Each experiment had a split‐plot randomized complete block design with mouldboard plough (CONV), minimum tillage (MT) with ripper tine and planting basins as main‐plot factor and maize residue mulch rate (0, 2 and 4 t/ha) as a subplot factor, with threefold replication. All subplots were surface mulched and weeded by hoe at the same time. We hypothesized that under MT weed growth would be considerable with maize monocropping but from year 3 of CA, weed growth would decrease and crop yield increase relative to values from unmulched CONV. Minimum tillage increased weed growth in 2nd year of maize monocropping. Under the maize–cowpea rotation, the considerable weed growth in planting basins was likely due to the large intrarow spacing and poor light competiveness of the cowpea variety. Mulch contributed to weed growth being suppressed by up to 36% under CA in the maize–cowpea–sorghum rotation relative to unmulched CONV. When planted on the same date, crop yield did not differ between CA and unmulched CONV. Maize–cowpea–sorghum rotation grain yield (3143 kg/ha) was double that under monocropping , probably due to improvements in soil physical and chemical conditions. 相似文献
15.
耕作方式对新垦沙地农田杂草群落结构的影响 总被引：1，自引：0，他引：1
通过田间调查的方式,研究了黑河中游边缘绿洲新垦沙地农田杂草分布状况,并对不同耕作方式下农田杂草群落结构特征进行了分析。调查中共记录杂草16种,隶属10科。新垦沙地农田杂草群落基本组成为藜(Chenopodium album)+牛筋草(Eleusineindica)+狗尾草(Setaria viridis)+反枝苋(Amaranthus retroflexus)。与当地传统的地膜覆盖、秋耕和玉米连作耕作方式相比,秸秆覆盖、减少秋耕和玉米-大豆轮作均可增加农田杂草物种丰富度、多样性指数和群落优势度(P0.05)。与当地传统耕作方式相比,秸秆覆盖可增加杂草群落中牛筋草优势度比,降低藜和反枝苋优势度比;减少秋耕可增加狗尾草、反枝苋、灰绿藜(C.glaucum)和米瓦罐(Silene conoidea)优势度比,降低牛筋草优势度比;玉米-大豆轮作可增加米瓦罐优势度比。不同耕作方式对偶见种杂草在田间的分布和组成影响不明显。可以看出,新垦沙地农田杂草物种较少,群落组成单一;不同耕作方式对新垦沙地农田杂草物种多样性和群落结构组成有明显影响,进一步深入研究对沙地农田杂草合理防除具有重要的指导意义。 相似文献
16.
María Inés Santín-Montanyá Encarnación Zambrana-Quesada José Luis Tenorio-Pasamón 《Archives of Agronomy and Soil Science》2018,64(12):1705-1713
Weed abundance in crops undergoes frequent changes, often due to changes in tillage practices. Annual species, with quick germination, a short vegetative stage, profuse seed production and long-lived seeds become problematic under zero-tillage systems. Portulaca oleracea L. and Amaranthus blitoides L. are widespread weeds in the Mediterranean area, prominent in irrigated crops. We studied the total weed abundance in the field, and specifically these two species (Portulaca oleracea and Amaranthus blitoides) with high frequency of occurrence in monoculture maize, from 2012 to 2014, in the field and soil seedbank. Results showed significant differences between zero-tillage (ZT) and conventional tillage (CT) systems on total weed abundance and relative abundance of Portulaca oleracea. Total weed abundance decreased in ZT plots (from 136 plants m?2 to 25 and 46 plants m?2, in 2013 and 2014 respectively). The same trend was observed in Portulaca oleracea recorded in ZT plots, but the abundance of Amaranthus blitoides did not vary in this system. Weed seedling germination and weed seed numbers both of total weed seedbank and Portulaca oleracea, were greater in ZT plots compared to CT, regarding Amaranthus blitoides seedling germination and seed count, the values did not increase with ZT, in continuous maize crops. 相似文献
17.
《Soil & Tillage Research》2002,67(1):85-98
Reduced tillage systems may be an option to allow rapid crop establishment in areas constrained by a short growing season, but such methods need to be adapted to soil tillage requirement and crop establishment needs. Rotation and tillage studies were conducted during a 6-year period on a fine sandy loam (Podzol) with silage maize (Zea mays L.) under the cool, humid climate, and relatively short growing season of Prince Edward Island, Atlantic Canada. The objective was to compare a continuous maize rotation with a maize–barley (Hordeum vulgare L.) rotation, using both no-tillage and conventional mouldboard ploughing for the maize, and to evaluate treatment effects on maize growth and productivity, weed populations, and soil quality. Plant population and maize yield were not consistently influenced by the tillage or rotation treatments. Mean maize yield ranged from 7.2 to 7.7 Mg ha−1. An increasing density of weeds over the 6-year period, especially perennial species, was evident under no-tillage, compared to mouldboard ploughing. Except for slight changes in soil pH, spatial variation in extractable soil P, and a higher level of organic C and labile forms of C (microbial biomass and mineralizable C), soil chemical quality was similar among treatments. An apparent decline in soil physical quality, as indicated by a reduction in macro-porosity volume and increase in soil penetration resistance below the 8 cm soil depth, was evident under the no-tillage at the end of the 6-year period. However, macro-pore continuity was less affected by a reduction in tillage, while field measurements of soil hydraulic conductivity increased under no-tillage compared to ploughing. The latter result may be related to the observed increase in earthworm population where tillage was reduced. Use of rotational tillage resulted in an intermediate soil physical condition between continuous no-tillage and ploughing. Overall, no-tillage appears a promising strategy to facilitate a fast and early establishment of maize on sandy loam soils in Atlantic Canada, but some ongoing monitoring of the soil physical condition would be required. 相似文献
18.
空心村整治还田材料土壤培肥效果分析 总被引：2，自引：0，他引：2
为改善空心村复垦为耕地后的土壤状况,迅速恢复农业生产,选取7种不同还田材料进行小区试验,分析了不同还田材料对土壤贮水量、养分含量、株高、玉米产量及水分利用效率的影响。结果表明:不同还田材料在夏玉米生长季0—105cm土层土壤贮水量显著高于对照(P0.05),生长季的平均土壤贮水量较对照增加了10.2~32.9mm;作物种植后不同还田材料下空心村复垦土壤较对照有机质、全氮、有效磷和速效钾含量分别提高了12.50%~66.44%,15.15%~20.00%,6.58%~64.62%和18.24%~26.82%,养分含量较对照差异显著(P0.05);各还田材料之间除全氮外,其他养分含量差异显著(P0.05);各还田材料夏玉米平均株高较对照差异显著,分别提高了13~29cm;TFC、TF、TSC、TSF和TFC处理相对于T0均显著提高了玉米产量,增幅为18.40%~48.50%,TF、TSC和TSF处理显著提高了夏玉米的水分利用效率,增幅为12.52%~44.47%。在黄土丘陵区空心村整治中,有机肥和粉煤灰的复合施用可明显改善农田土壤水热及养分含量状况,增加夏玉米株高、产量和水分利用效率,是黄土丘陵空心村整治中最适合的还田材料,对提升空心村整治还田质量有重要的意义。 相似文献
19.
添加生物黑炭对玉米产量、品质、肥料利用率及氮磷径流损失的影响 总被引：3，自引：0，他引：3
为了寻找一种既能使作物高产、优质又环境友好的施肥模式,在天然降雨条件下,通过田间小区试验,研究了5种不同施肥模式(不施肥、纯施化肥、生物黑炭与化肥共施、有机无机肥配施、有机无机肥配施添加生物黑炭)对玉米产量、品质、肥料利用率及氮磷径流损失的影响。结果表明:与纯施化肥相比,生物黑炭与化肥共施和有机无机肥配施对玉米产量无明显影响,有机无机肥配施添加生物黑炭可使玉米产量显著提高21.14%;与纯施化肥相比,生物黑炭与化肥共施、有机无机肥配施、有机无机肥配施添加生物黑炭均可提高粗蛋白含量和氮、磷肥利用率,其中对粗蛋白含量提高幅度为12.14%~19.64%,并以有机无机肥配施添加生物黑炭对其提高幅度最大;与纯施化肥相比,生物黑炭与化肥共施、有机无机肥配施、有机无机肥配施添加生物黑炭均可显著减少氮、磷径流损失量,降幅分别为30.47%~59.69%和12.08%~31.22%,其中,有机无机肥配施添加生物黑炭的氮素径流损失降幅最大,生物黑炭与化肥共施的磷素径流损失降幅最大。因此,从提高玉米产量、品质,氮、磷肥利用率以及减少土壤氮、磷径流损失的角度综合考虑,在旱地作物种植施肥模式中推荐有机无机肥配施添加生物黑炭施肥模式。 相似文献
20.
Anthony Imoudu Oyeogbe Tapas Kumar Das Kali Kinkar Bandyopadhyay 《Archives of Agronomy and Soil Science》2018,64(12):1635-1645
Conservation agriculture (CA) practice increases agronomic productivity and soil fertility, yet CA stimulate nitrogen (N) immobilization and weed interference during the early periods of implementation. This study focuses on efficient N management by soil testing and optical sensor (GreenSeekerTM) information; and weed management using brown manuring (Sesbania aculeata co-culture) and herbicide mixtures under CA-based maize (Zea mays L.) – wheat (Triticum aestivum L. emend Fiori & Paol) system in the Indo-Gangetic Plains. Fertilizer N application guided by the optical sensor increased grain yields of maize and wheat up to 20 and 14% (average of two years), respectively, compared to whole N application at sowing. Weed management using brown manuring in maize and herbicide mixtures in wheat increased the grain yields up to 10 and 21%, respectively, over the weedy check. The optical sensor-based N management saved up to 45 and 30 kg N ha–1 of the optimized N fertilizer rate in maize and wheat, respectively, over whole N application. Fertilizer N management coupled with brown manuring resulted in 5 and 4% higher soil organic carbon accumulation. Implementing efficient N fertilizer and weed management in the early years of CA can improve agronomic yield, fertilizer savings, and soil organic carbon content. 相似文献