Agricultural Meteorology最新文献_第7页

Agroclimatic classification of the semi-arid tropics III. Characteristics of variables relevant to crop production potential 半干旱热带地区的农业气候分类III。与作物生产潜力有关的变量特征

Agricultural Meteorology Pub Date : 1984-01-01 DOI: 10.1016/0002-1571(84)90003-7

S. Jeevananda Reddy (Consultant(Agroclimatology))

引用次数: 6

A theoretical basis for the leaf equivalence point temperature 叶片等当点温度的理论基础

Agricultural Meteorology Pub Date : 1984-01-01 DOI: 10.1016/0002-1571(84)90001-3

Kyaw Tha Paw U

引用次数: 13

On the night transpiration of greenhouse roses under glass or plastic cover 对夜间蒸腾的温室玫瑰用玻璃或塑料罩住

Agricultural Meteorology Pub Date : 1984-01-01 DOI: 10.1016/0002-1571(84)90002-5

Ido Seginer

引用次数: 30

Agroclimatic classification of the semi-arid tropics IV. Classification of India, Senegal and Upper Volta 半干旱热带地区的农业气候分类。印度、塞内加尔和上沃尔特的分类

Agricultural Meteorology Pub Date : 1984-01-01 DOI: 10.1016/0002-1571(84)90004-9

S. Jeevananda Reddy (Consultant(Agroclimatology))

{"title":"Agroclimatic classification of the semi-arid tropics IV. Classification of India, Senegal and Upper Volta","authors":"S. Jeevananda Reddy (Consultant(Agroclimatology))","doi":"10.1016/0002-1571(84)90004-9","DOIUrl":"10.1016/0002-1571(84)90004-9","url":null,"abstract":"<div><p>To arrange the 190 locations in India, Senegal and Upper Volta into finite groups, numerical taxonomic techniques were adopted, using 11 agroclimatic variables derived from parts I, II and III of this study. The results obtained using the data matrix of 7 principal coordinates with Euclidean metric — unweighted pair group method using arithmetic averages (UPGMA) fusion strategy appear to be the most suitable to identify groups formed in India and West Africa. In general, this study separated the highly undependable locations with different effective rainy periods. The groups identified are not homogeneous in terms of dependability defining dry-seeding feasibility, at the lower end of the range, and water-logging hazards. Therefore, to overcome this problem, the groups were first arranged into 3 broad zones, namely arid, semi-arid and sub-humid according to a modified Thornthwaite approach, and the semi-arid locations were further divided into 5 zones based on the effective rainy period related to the cropping pattern. As the primary groupings refer to the most stable situation, they were again divided into 5 sub-zones each based on the level of dependability, which was characterized by the standard deviation of the commencement time of sowing rains. To account for some of the operational problems, such as water-logging, availability of field work days for cultural operations, etc., they were further divided into groups and sub-groups based on wet and dry spells and aridity index.</p><p>The derived zones and sub-zones of the semi-arid tropics are straight forward and easily memorised, and make sense agronomically. With the given classification structure it is easy to add new locations without further numerical analysis.</p></div>","PeriodicalId":100061,"journal":{"name":"Agricultural Meteorology","volume":"30 4","pages":"Pages 293-325"},"PeriodicalIF":0.0,"publicationDate":"1984-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0002-1571(84)90004-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89002463","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: 4

Recently published papers 最近发表的论文

Agricultural Meteorology Pub Date : 1984-01-01 DOI: 10.1016/0002-1571(84)90006-2

引用次数: 0

Agroclimatic classification of the semi-arid tropics I. A method for the computation of classificatory variables 半干旱热带地区的农业气候分类。分类变量的计算方法

Agricultural Meteorology Pub Date : 1983-12-01 DOI: 10.1016/0002-1571(83)90051-1

S.Jeevananda Reddy

引用次数: 20

Radiation balance of soybeans grown in Brazil 巴西大豆的辐射平衡

Agricultural Meteorology Pub Date : 1983-12-01 DOI: 10.1016/0002-1571(83)90049-3

R.G.B. Andre , Y. Viswanadham

{"title":"Radiation balance of soybeans grown in Brazil","authors":"R.G.B. Andre , Y. Viswanadham","doi":"10.1016/0002-1571(83)90049-3","DOIUrl":"10.1016/0002-1571(83)90049-3","url":null,"abstract":"<div><p>This paper describes an experimental study of the radiation balance over a growing soybean (<em>Glycine max</em> (L.) Merrill) crop at a tropical agricultural experimental station, Jaboticabal (22°15′S 48°18′W), São Paulo, Brazil. Incoming shortwave radiation, <em>S</em>, net radiation, <em>R</em>, and the shortwave reflection coefficient, α, were measured over this crop from November 1976 to April 1977, and net longwave radiation, <em>L</em>, was deduced from the radiation balance equation. Hourly variation of the radiation components, <em>S</em>, <em>αS</em>, <em>R</em> and <em>L</em>, are presented for 4 nearly clear sky-days during the different growing crop periods. The diurnal variation of α is also presented for these 4 days. The mean daily albedo values for this vegetative surface were between 0.12 and 0.26, and inversely related to the vegetation height. A regression analysis of the radiation balance equation has been made, and the heating coefficient, β, and the longwave exchange coefficient, λ, obtained. The results of the study indicate that both β and λ are found to be descriptively helpful parameters in agricultural meteorology. Predicted regression equations for net radiation from shortwave radiation are presented for the different periods.</p></div>","PeriodicalId":100061,"journal":{"name":"Agricultural Meteorology","volume":"30 3","pages":"Pages 157-173"},"PeriodicalIF":0.0,"publicationDate":"1983-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0002-1571(83)90049-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72764350","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

Estimating net short-wave radiation with the Bellani pyranometer 用贝拉尼辐射计估算净短波辐射

Agricultural Meteorology Pub Date : 1983-12-01 DOI: 10.1016/0002-1571(83)90050-X

P.Y. Bernier , A.P. Plamondon

引用次数: 1

Agroclimatic classification of the semi-arid tropics II. Identification of classificatory variables 半干旱热带地区的农业气候分类II。分类变量的识别

Agricultural Meteorology Pub Date : 1983-12-01 DOI: 10.1016/0002-1571(83)90052-3

S.Jeevananda Reddy

{"title":"Agroclimatic classification of the semi-arid tropics II. Identification of classificatory variables","authors":"S.Jeevananda Reddy","doi":"10.1016/0002-1571(83)90052-3","DOIUrl":"10.1016/0002-1571(83)90052-3","url":null,"abstract":"<div><p>Eight agroclimatic variables related to crop production potential in the semi-arid tropics of India are identified. These are used to assess dry-seeding feasibility, water-logging hazard, risk in agricultural production, cropping patterns and their spatial distribution, using data from 80 locations in India. Regression analysis has been used to identify differences between locations at different scales, i.e., local differences caused by orography, regional differences associated with circulation patterns and continental differences associated with general circulation patterns. Using the data of 8 variables from 199 locations in India and two west African countries (Senegal and Upper Volta) three dissimilarity parameters were derived. The basic dissimilarity observed on a continental scale is that for the same amount of mean annual rainfall the growing season is longer in west Africa than in India. Thus, in west Africa the corresponding wet and dry spells within the available effective rainy period are quite different from India. This will have a significant influence on farming systems in general, and on the identification of adopted crop/cropping systems in particular.</p></div>","PeriodicalId":100061,"journal":{"name":"Agricultural Meteorology","volume":"30 3","pages":"Pages 201-219"},"PeriodicalIF":0.0,"publicationDate":"1983-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0002-1571(83)90052-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79854853","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: 5

Recently published papers 最近发表的论文

Agricultural Meteorology Pub Date : 1983-12-01 DOI: 10.1016/0002-1571(83)90054-7

引用次数: 0