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The loss and maintenance of native crops in mountain agriculture

The loss and maintenance of native crops in mountain agriculture
Agricultural practice ; Andes ; Crop ; Farming system ; Maize;Corn ; Mountain ; Mountain farming ; Peasantry ; Peru ; Potatoe ; Tropical zone
Four native crops (potatoes, maize, ulluco, quinoa) cultivated in the southern Peruvian sierra demonstrate different patterns of cultivar loss and cultivar maintenance. Contingent social, economic and environmental conditions in mountain agriculture
shape the distinct fates befalling the cultivars in each crop.

Multi-objective programming model of tropical crops in Hainan Island

Multi-objective programming model of tropical crops in Hainan Island
According to Hainan Island's biological characteristics, and existing structure of productivity of tropical crops and local climatic conditions, this paper carries on regional division of tropical crops by fuzzy mathematics. Based on calculation
of basic parameters for the formation of production, near-term optimum models of tropical crops structure of each region was established by means of multi-objective programming.

Preliminary analyses for crop water consumption by using lysimeter

Preliminary analyses for crop water consumption by using lysimeter
Agriculture ; Cereal ; China ; Crop yield ; Drainage ; Evapotranspiration ; Irrigation ; Northern China ; Water ; Water management ; Water needs
This paper deliberates on the issue of water consumption (evapotranspiration, ET) of 3 main crops in North China : wheat, corn and bean, its relation with crop yield and the possible use of thus in the water saving practice.

Field water surplus and deficit of major crops in dryland of northern China

Field water surplus and deficit of major crops in dryland of northern China
Agroclimatology ; Arid area ; China ; Climatic data ; Crop ; Evapotranspiration ; Irrigation ; Northern China ; Precipitation ; Soil properties ; Water ; Water balance ; Water needs
Based on measurements of soil and crop characteristics and mean climatic data (1950-1980), this paper discusses field water surplus or deficit and its pattern of major crops in dryland of northern China, aiming to provide a scientific basis

The effects of gas flaring on crops in the Niger Delta, Nigeria

The effects of gas flaring on crops in the Niger Delta, Nigeria
Agriculture ; Air temperature ; Crop yield ; Delta ; Fire ; Natural gas ; Niger ; Nigeria ; Oil exploration ; Pollution ; Soil temperature ; Spatial analysis ; Statistical analysis
This study explores the effects of gas flaring on commonly cultivated crops in the Niger Delta region of Nigeria. It attempts a spatial gradient analysis of crop growth and development near a gas flaring site at Eleme, Rivers state, Nigeria.

Cost-return analysis of the substitution of food crops for rubber in the small holder cropping system of Southern Nigeria : a case study of Bendel State

Cost-return analysis of the substitution of food crops for rubber in the small holder cropping system of Southern Nigeria : a case study of Bendel State
Monetary return food crops enterprise compares favourably with returns from other economic activities while that from rubber does not. It is estimated that by 1991 rubber plantations may be eliminated in this study area if the present trend

Experiences with crop residue cover and direct seeding in the Bolivian highlands

Experiences with crop residue cover and direct seeding in the Bolivian highlands
Agriculture ; Bolivia ; Cereal ; Crop ; Farm ; Mountain ; Soil degradation ; Water management
For small farmers in the Bolivian highlands, wheat crop production is limited by moisture stress and soil erosion. A. discusses research in two Bolivian departments, Chuquisaca and Cochabamba, conducted to increase water-use efficiency
and productivity. Crop residue increased water infiltration and yields in the Cochabamba high valley. However, in Chuquisaca the effects of ground cover were small or negative. Seeders are discussed. - (SLD)

Species for niches : when and for whom are cover crops appropriate ?

Species for niches : when and for whom are cover crops appropriate ?
Agricultural land use ; Agriculture ; Bolivia ; Crop ; Farming system ; Honduras ; Latin America ; Soil conservation ; Water management
Cover crops occupy temporary niches during the intensification and integration of farming systems. What cover crops may be most appropriate depends on the stakeholder (donors, governments, and NGOs v. farmers), economic factors, and resource

The grading of agroclimatic calamities for assessing mean annual loss rate of crops : a case study in Hebei province

The grading of agroclimatic calamities for assessing mean annual loss rate of crops : a case study in Hebei province
Agricultural damage ; Agroclimatology ; Catastrophe ; China ; Climatic event ; Crop ; Geographical information system ; Hebei ; Model ; Spatial differentiation
A mean annual loss rate (MALR) is a measure of the damaging degree of different crops to agroclimatic calamities such as waterlogging, strong wind, hail and dry-hot wind. Based on the meteorological data observed from 1961 to 1993 in Hebei province
and the damaging grades of some crops to meteorological disasters, the AA. establish the index systems of agroclimatic calamities and then calculate the MALR with hierarchical models. Finally, GIS-based spatial maps on MALR has been employed to exhibit regional
differentiation of mean annual loss rate of crops.

Response of four andean crops to rotation and fertilization

Response of four andean crops to rotation and fertilization
Agricultural practice ; Agriculture ; Andes ; Crop rotation ; Ecuador ; Fertilizer ; Mountain ; Sustainable development ; Years 1990-99
Five-year study at the Santa Catalina experimental station of the National Institute for Agricultural Research, INIAP-Ecuador evaluates the effects of monocropping and crop rotation on yield, above-ground biomass, and weeds associated with four
andean crops planted with and without fertilizer. Best sequences for yield and biomass production were lupine (NF)-quinoa, lupine (NF)-melloco, potato (F)-quinoa (NF), melloco-quinoa, and lupine (NF)-potato. weeds were not affected by previous crop

Productivity and economic benefits of integrated nutrient management in three major cropping systems in the Mid-Hills of Nepal

Productivity and economic benefits of integrated nutrient management in three major cropping systems in the Mid-Hills of Nepal
Agricultural productivity ; Agriculture ; Crop ; Crop rotation ; Farming system ; Fertilizer ; Middle mountain ; Nepal ; Profitability ; Rice
Applications of manure and inorganic fertilizer together (integrated nutrient management) may allow sustained higher crop yields and greater economic benefits than does either applied alone. This concept is being tested in three of the major crop

The persistence of milpa agriculture in highland Guatemala in Festschrift to honor Raymond E. Crist.

The word milpa refers to a crop field in which maize is the principal crop. But the technology used may vary and many other crops, some of recent acceptance, may be integrated into it. - (DWG)

American crop plants in Asia prior to European contact

American crop plants in Asia prior to European contact
The AA. claim to have found references to 13 New World species of plants in the ancient literature and archeological record of Asia that point to the presence in the Old World of these crops well before 1492 A. D. - (DWG)

Heavy metal concentrations in soils and crops of Baoshan-Wusong area, Shanghai, China

Heavy metal concentrations in soils and crops of Baoshan-Wusong area, Shanghai, China
The AA. study the spatial distribution of metal concentration in soils and crops and determine abnormal differences in metal content between the samples and regional background. Statistical data reveal that the high level of metal concentrations

A növénytermesztés intenzitásának térbeli rendje Európában

Agricultural data ; Agricultural product ; Agriculture ; Crop yield ; Europe ; Spatial differentiation
In this paper the spatial differentiation of the intensity of agricultural crop production in Europe is investigated. Based on yields statistics of the five major crops (wheat, maize, barley, potato and sugar beet) the intensity of agricultural

Four endimic Andean tuber crops : promising food resources for agricultural diversification

Four endimic Andean tuber crops : promising food resources for agricultural diversification
Distribution, habitats, cultivation practices, use, nutritional value, and germplasm sources for the indigenous tuber crops of maca, ullucu, oca and anu. - (D. W. Gade).

Cropped and irrigated lands in Andhra Pradesh, India : a study on their association

Cropped and irrigated lands in Andhra Pradesh, India : a study on their association
An attempt has been made to assess the association between cropped and irrigated area on the basis of product moment correlation coefficient. Andhra Pradesh is primarily an agricultural state where over one third of the net sown area is irrigated

Szantofoldi novényeink természetfoldrajzi tajakra torténo ajanlasanak gyors gyakorlati modszere. (An express pratice to recommend our ploughland crops to physical geographical regions)

Szantofoldi novényeink természetfoldrajzi tajakra torténo ajanlasanak gyors gyakorlati modszere. (An express pratice to recommend our ploughland crops to physical geographical regions)
Along with a general recommendation of new ploughland crop hybrids, a specified one to physical geographical regions is also needed. Climatic parameters for regions are collected to characterize climatic types/continental, mediterranean, oceanic

An automated assessment of environmental qualities. Assessing crop cultivation in Geographical essays in Hungary.

An automated assessment of environmental qualities. Assessing crop cultivation in Geographical essays in Hungary.
of crops and application in text areas are outlined. (DLO).

Yield variability of crops in Japan

Yield variability of crops in Japan
Yield and climate data are analysed to obtain relationships between yield variability and weather variability. The analysis indicates that the influence of weather variability on crop yield is greater in regions with poor agroclimatic resources than

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