Crop Management最新文献_第8页

Evaluating the Influence of Various Seeding Rates on Weed Removal Timing in Glyphosate-Resistant Soybean 评价不同播量对抗草甘膦大豆除草时机的影响

Crop Management Pub Date : 2013-02-26 DOI: 10.1094/CM-2013-0226-01-RS

Jason M. Sarver, Chad D. Lee, J. D. Green, James H. Herbek, James R. Martin

{"title":"Evaluating the Influence of Various Seeding Rates on Weed Removal Timing in Glyphosate-Resistant Soybean","authors":"Jason M. Sarver, Chad D. Lee, J. D. Green, James H. Herbek, James R. Martin","doi":"10.1094/CM-2013-0226-01-RS","DOIUrl":"https://doi.org/10.1094/CM-2013-0226-01-RS","url":null,"abstract":"Reduced seeding rate in glyphosate-resistant soybean [Glycine max (L) Merr.] may influence the critical time of herbicide application. Field studies were conducted across four environments in Kentucky to determine the effect of seeding rate and glyphosate application timing on soybean seed yield, weed control, light interception at growth stage R1 and canopy closure at R5. Soybean was seeded at rates of 75,000, 125,000, and 175,000 seeds/acre, while glyphosate was applied at 3 weeks after planting (WAP), 5 WAP, 7 WAP, or 3 & 7 WAP. Seed yield at 125,000 seeds/acre was greater than at 75,000 seeds/acre rate in two of four environments. There were no yield differences between 125,000 and 175,000 seeds/acre. Sequential applications of glyphosate at 3 and 7 WAP as well as a single application at 5 WAP always resulted in seed yield equal to a weed free herbicide program. Yields from the 3 WAP treatment was lower than weed free in three of four environments. Seeding rate did not influence the optimum timing for a spray application for any of the factors measured, indicating that glyphosate herbicide programs do not need to be adjusted when seeding rate is reduced.","PeriodicalId":100342,"journal":{"name":"Crop Management","volume":"12 1","pages":"1-8"},"PeriodicalIF":0.0,"publicationDate":"2013-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1094/CM-2013-0226-01-RS","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91940260","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Comparing Acala Defoliation Timings with Yield and Quality 猕猴桃落叶时间与产量和品质的比较

Crop Management Pub Date : 2013-01-23 DOI: 10.1094/CM-2013-0123-01-RS

Steven D. Wright, Robert B. Hutmacher, Gerardo Banuelos, Bruce A. Roberts, Daniel S. Munk, Katherine A. Wilson, Sonia I. Rios, Kelly A. Hutmacher, Mark P. Keeley, Jonathan F. Wrobles

{"title":"Comparing Acala Defoliation Timings with Yield and Quality","authors":"Steven D. Wright, Robert B. Hutmacher, Gerardo Banuelos, Bruce A. Roberts, Daniel S. Munk, Katherine A. Wilson, Sonia I. Rios, Kelly A. Hutmacher, Mark P. Keeley, Jonathan F. Wrobles","doi":"10.1094/CM-2013-0123-01-RS","DOIUrl":"https://doi.org/10.1094/CM-2013-0123-01-RS","url":null,"abstract":"Chemical defoliation is a necessary pre-harvest practice in cotton (Gossypium hirsutum L.) production in California, and all harvest aid efforts require proper timing to preserve cotton lint yield and quality. Generally, cotton growers are advised to begin defoliation as early as possible, but not so early that they cause yield and quality loss. In order to have confidence in this final pre-harvest step, growers monitor the growth stage of their crop by counting the number of nodes above cracked boll (NACB). In California, it is common practice to apply the first defoliant treatment at 4 NACB, which corresponds with the US Cotton Belt's recommended timing, which is when 60% of the harvestable bolls are open (9,20). It can be beneficial to have an early defoliant application because often it leads to an earlier harvest. This early harvest allows cotton growers to conduct their harvest prior to the onset of adverse late-season fog or rains that can occur in California's San Joaquin Valley and make harvests more difficult. The objective of this research on San Joaquin Valley Acala cotton was to compare the impact of different rates of Ginstar (thidiazuron/diuron) or Ginstar plus Finish (ethephon/cyclanilide) on defoliation, yield, and fiber quality of cotton when defoliant applications were initiated at the earlier 6 NACB timing, which corresponds to 40% open boll versus the common 4 NACB timing. Starting the defoliation process with an Acala cultivar at 6 NACB instead of at 4 NACB did not significantly affect yield or cotton HVI (high volume instrument) fiber quality characteristics. Earlier defoliation could be of significant benefit in years when later-maturing crops or worsening harvest-season weather necessitate the initiation of an earlier harvest.","PeriodicalId":100342,"journal":{"name":"Crop Management","volume":"12 1","pages":"1-15"},"PeriodicalIF":0.0,"publicationDate":"2013-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91865789","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Corn Yield Response to Deep Subsurface Drip Irrigation in the Southeast 东南地区深层地下滴灌对玉米产量的影响

Crop Management Pub Date : 2013-01-22 DOI: 10.1094/CM-2013-0122-01-RS

Ronald B. Sorensen, Christopher L. Butts, Marshall C. Lamb

{"title":"Corn Yield Response to Deep Subsurface Drip Irrigation in the Southeast","authors":"Ronald B. Sorensen, Christopher L. Butts, Marshall C. Lamb","doi":"10.1094/CM-2013-0122-01-RS","DOIUrl":"https://doi.org/10.1094/CM-2013-0122-01-RS","url":null,"abstract":"Long term grain corn (Zea mays L.) yield with various crop rotations irrigated with subsurface drip irrigation (SSDI) is not known for southeast United States. A subsurface drip irrigation system was installed on Tifton loamy sand with three crop rotations, two drip tube lateral spacings, and three irrigation levels. Crop rotations were alternate year, back-to-back, and three years between corn crops. Drip tube laterals were installed underneath each crop row (narrow) and alternate row middles (wide). Crops were irrigated daily at 100, 75, and 50% of estimated crop water use. Irrigation level affected corn yield 6 out of 8 years with 50% irrigation level having lower yield compared with 75 or 100% irrigation level. The 50% irrigation level averaged 7327 kg/ha while the 75 and 100% irrigation levels averaged 9334 and 9691 kg/ha, respectively. The narrow lateral spacing increased corn grain yield 50% of the time but the higher yield may not offset the cost of the increased tubing compared with the wider lateral spacing. There is no clear evidence indicating one specific crop rotation better than another. Applying irrigation at 75% of recommended water use did not reduce crop yield, implying a possible 25% water savings compared with full irrigation.","PeriodicalId":100342,"journal":{"name":"Crop Management","volume":"12 1","pages":"1-9"},"PeriodicalIF":0.0,"publicationDate":"2013-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1094/CM-2013-0122-01-RS","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91937397","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Agronomic Evaluation of Coated Urea to Reduce Ammonia Volatilization from Side-dress Applications to Corn 包膜尿素减少玉米侧施氨挥发的农艺评价

Crop Management Pub Date : 2013-01-17 DOI: 10.1094/CM-2013-0117-01-RS

William Hunter Frame, Marcus M. Alley, Wade Thomason, Garnett Whitehurst, Brooks Whitehurst, Robert Campbell

{"title":"Agronomic Evaluation of Coated Urea to Reduce Ammonia Volatilization from Side-dress Applications to Corn","authors":"William Hunter Frame, Marcus M. Alley, Wade Thomason, Garnett Whitehurst, Brooks Whitehurst, Robert Campbell","doi":"10.1094/CM-2013-0117-01-RS","DOIUrl":"https://doi.org/10.1094/CM-2013-0117-01-RS","url":null,"abstract":"Urea has become the dominant synthetic nitrogen fertilizer used worldwide; however, surface application of urea based fertilizers can lead to significant volatilization losses. The objectives of this research were: (i) to compare the effect of urea with and without the urease inhibitor N-(n-butyl) thiophosphoric triamide (NBPT) on corn ear leaf N concentration and grain yield; and (ii) to compare the effect of sulfate salts as coatings with and without NBPT on N concentration in corn ear leaves and corn grain yield in field studies. Urea and Arborite Ag, NBPT, were applied at four N rates: 50, 100, 150, and 200 lb/N acre; and the other seven coated urea treatments were applied at 100 lb N/acre at V5-V7. The N concentration in corn ear leaves was significantly increased using Arborite Ag at 5 out the 10 locations during the study at α = 0.1. Regression analyses to predict N concentration in corn ear leaves and grain yield with N rates were significant for all 10 locations for N in corn ear leaves and 9 out of 10 for grain yield; however, the analyses indicate the N rate used to compare coated treatments (100 lb N/acre) was too high to detect treatment differences.","PeriodicalId":100342,"journal":{"name":"Crop Management","volume":"12 1","pages":"1-13"},"PeriodicalIF":0.0,"publicationDate":"2013-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1094/CM-2013-0117-01-RS","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91844519","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Impact of Starter Fertilizer on Cotton Growth, Development, Lint Yield, and Fiber Quality Production for an Early Planted No-Till System 初施化肥对早播免耕棉花生长发育、皮棉产量和纤维品质的影响

Crop Management Pub Date : 2013-01-01 DOI: 10.1094/CM-2013-0012-RS

W. Pettigrew, W. Molin

引用次数: 3

Increasing Crop Rotation Diversity Improves Agronomic, Economic, and Environmental Performance of Organic Grain Cropping Systems at the USDA‐ARS Beltsville Farming Systems Project 在美国农业部-农业研究协会贝尔茨维尔农业系统项目中，增加作物轮作多样性提高了有机粮食种植系统的农艺、经济和环境绩效

Crop Management Pub Date : 2013-01-01 DOI: 10.1094/CM-2013-0429-02-PS

M. Cavigelli, J. Teasdale, J. Spargo

引用次数: 19

Evaluating the Influence of Various Seeding Rates on Weed Removal Timing in Glyphosate-Resistant Soybean 评价不同播量对抗草甘膦大豆除草时机的影响

Crop Management Pub Date : 2013-01-01 DOI: 10.1094/CM-2013-0226-01-RS

J. Sarver, Chad D. Lee, Jonathan D Green, J. Herbek, James R. Martin