Agro-Ecosystems最新文献

Energy and economics of intensive animal production 集约化动物生产的能源和经济学

Agro-Ecosystems Pub Date : 1983-02-01 DOI: 10.1016/0304-3746(83)90002-1

C.R.W. Spedding, A.M.M. Thompson, M.R. Jones

引用次数: 4

Harvest time residues of DDT and HCH in the Punjab wheat crop untreated with these chemicals 未经这些化学品处理的旁遮普小麦作物中滴滴涕和六氯环己烷的收获期残留物

Agro-Ecosystems Pub Date : 1983-02-01 DOI: 10.1016/0304-3746(83)90008-2

R.P. Chawla, R.L. Kalra

引用次数: 8

Soils and agriculture 土壤与农业

Agro-Ecosystems Pub Date : 1983-02-01 DOI: 10.1016/0304-3746(83)90014-8

P. Jacquard

引用次数: 0

Environmental protection and biological forms of control of pest organisms 环境保护和生物形式的害虫控制

Agro-Ecosystems Pub Date : 1983-02-01 DOI: 10.1016/0304-3746(83)90010-0

Bryan D. Frazer

引用次数: 0

The role of nitrogen in intensive grassland production 氮在集约化草地生产中的作用

Agro-Ecosystems Pub Date : 1983-02-01 DOI: 10.1016/0304-3746(83)90011-2

E.F. Henzell

引用次数: 0

Effects of intensive production methods on livestock health 集约化生产方式对牲畜健康的影响

Agro-Ecosystems Pub Date : 1983-02-01 DOI: 10.1016/0304-3746(83)90005-7

H.S. Siegel

引用次数: 13

Organic farming in the United States: Principles and perspectives 美国的有机农业:原则和观点

Agro-Ecosystems Pub Date : 1983-02-01 DOI: 10.1016/0304-3746(83)90003-3

J.F. Parr, R.I. Papendick, I.G. Youngberg

{"title":"Organic farming in the United States: Principles and perspectives","authors":"J.F. Parr, R.I. Papendick, I.G. Youngberg","doi":"10.1016/0304-3746(83)90003-3","DOIUrl":"10.1016/0304-3746(83)90003-3","url":null,"abstract":"<div><p>A growing number of agricultural scientists, environmentalists, government officials, farmers, and both urban and rural laymen, have become increasingly alarmed over the potential vulnerability of the energy-intensive systems of food and fiber production which now characterize U.S. agriculture. During the past 40 years, conventional agriculture has become increasingly dependent upon petroleum-based, chemically-synthesized fertilizers and pesticides to supply plant nutrients and for crop protection. Certainly these energy-intensive technologies have contributed greatly to the U.S.'s agricultural productivity. However, sharply escalating production costs associated with the increasing cost and uncertain availability of energy, i.e. fuel and fertilizers, have generated considerable interest in less expensive and more environmentally compatible production alternatives such as organic farming. The apparent decline in soil productivity throughout the U.S. from excessive soil erosion, nutrient runoff, and loss of soil organic matter; the impairment of environmental quality from sedimentation and pollution of natural waters by agricultural chemicals; and, the potential hazards to human and animal health and food safety from heavy use of pesticides, have also stimulated interest in organic farming systems of food production. This article describes and analyzes the agronomic and socioeconomic character of organic farming in the U.S. and assesses its future potential contribution to the overall system of food and fiber production in this country and abroad. Clearly, a number of factors, such as future research and education programs, public policies, and the cost and availability of conventional farm production inputs, will greatly influence the rate at which organic farming technologies and management practices are adopted. However, current trends and circumstances indicate that organic farming systems will play an increasingly important role in both U.S. and world agriculture.</p></div>","PeriodicalId":100066,"journal":{"name":"Agro-Ecosystems","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1983-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0304-3746(83)90003-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88059648","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: 21

Nutrient loss from disturbed forest watersheds in Oregon's coast range 俄勒冈州海岸地区受干扰的森林流域的营养流失

Agro-Ecosystems Pub Date : 1983-02-01 DOI: 10.1016/0304-3746(83)90001-X

James H. Miller , Michael Newton

引用次数: 13

Reactions of the iron chelates and the sodium salts of EDTA, DTPA and EDDHA with two alkaline soils, and their effectiveness during growth of barley 铁螯合物与EDTA、DTPA和EDDHA钠盐在两种碱性土壤中的反应及其对大麦生长的影响

Agro-Ecosystems Pub Date : 1983-02-01 DOI: 10.1016/0304-3746(83)90004-5

Samir A. Aboulroos, Ezzat A. El Beissary, Assia A. El Falaky

{"title":"Reactions of the iron chelates and the sodium salts of EDTA, DTPA and EDDHA with two alkaline soils, and their effectiveness during growth of barley","authors":"Samir A. Aboulroos, Ezzat A. El Beissary, Assia A. El Falaky","doi":"10.1016/0304-3746(83)90004-5","DOIUrl":"10.1016/0304-3746(83)90004-5","url":null,"abstract":"<div><p>The behaviour of the iron chelates and sodium salts of EDTA, DTPA and EDDHA in calcareous (iron deficient) and alluvial (border-line iron deficient) soils and their effectiveness during plant growth were studied. The effectiveness of the iron chelates in maintaining soluble iron and in supplying barley with iron was in the order Fe-EDTA < Fe-DTPA < Fe-EDDHA. Replacement of iron by other cations in Fe-EDTA and Fe-DTPA, rather than adsorption of iron chelate by the soil, was the main factor influencing their effectiveness. The equilibrium of Fe-EDTA with soils was dominated by competition between iron and calcium, whereas that of Fe-DTPA was dominated by iron being in competition with manganese initially and with calcium, zinc and copper afterwards. The relative dominance of the chelate of the competing cation varied with soil type. Fe-EDDHA was neither adsorbed nor was its iron fixed by the soil to any great extent.</p><p>The sodium salt of DTPA and EDDHA continually dissolved native soil iron but increased soluble manganese only temporarily. Dissolution of native zinc and copper was least with EDTA and EDDHA and most with DTPA. The sodium salts of the chelating agents were as effective as the iron chelates in supplying barley with iron in the alluvial soil, which was marginally deficient, whereas they were much less effective in the calcareous soil, where iron supply is a greater problem.</p></div>","PeriodicalId":100066,"journal":{"name":"Agro-Ecosystems","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1983-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0304-3746(83)90004-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76355142","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

Comparison of soil surface arthropod populations in conventional tillage, no-tillage and old field systems 常规耕作、免耕和旧田制土壤表面节肢动物种群的比较

Agro-Ecosystems Pub Date : 1983-02-01 DOI: 10.1016/0304-3746(83)90007-0

A.Y. Blumberg, D.A. Crossley Jr.

引用次数: 101