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Eco-emigration and the return of marginal agricultural land to forestry can be practiced.
      
Nitrate has been recognized as the dominant mineral nitrogen form in most agricultural soils and the main nitrogen source for crops, but it is not usually the case in forest ecosystems.
      
We conclude that the program of converting agricultural lands to forest-grass lands is an effective way in improving soil anti-erosion capability.
      
The 26 remaining spectral clusters were merged into six vegetation types using the Chinese vegetation taxonomy system: evergreen broad-leaved forest, coniferous forest, bamboo forest, shrub-grass, aquatic vegetation, and agricultural vegetation.
      
The spatial distribution and areal extent for the coniferous forests, shrub-grass, evergreen broad-leaved forests, and agricultural vegetation were calculated and compared with the Vegetation Atlas of China at a 1:1,000,000 scale.
      
The spatial accuracy and the area accuracy for coniferous forests, shrub-grass, evergreen broad-leaved forests, and agricultural vegetation were 79.2%, 91.3%, 68.2% and 95.9% and 92.1%, 95.9%, 63.8% and 90.5%, respectively.
      
canadensis has become an invasive weed in eastern China, and has caused serious damages to agricultural production and ecosystems in several provinces in China.
      
Pollution of agricultural land by heavy metals has imposed an increasingly serious risk to environmental and human health in recent years.
      
Heavy metal pollutants may enter the human food chain through agricultural products and groundwater from the polluted soils.
      
However, in most cases, agricultural land in China cannot afford to grow phytoremediator plants instead of growing crops due to food supply for the great population.
      
Agricultural activity is one of the most important sources of aerosol particles.
      
The results show that fertilizer and soil are important factors determining the aerosol particle over agricultural fields, and vegetable fields in suburban Beijing contribute significantly to the aerosol particle.
      
Data on structural and functional changes in the photosynthetic apparatus of agricultural plants are presented.
      
The content of six of the eleven mineral components studied (K, Ca, Na, Mo, Mn, and Cr) in callus cultures was higher than that in roots of agricultural ginseng plants.
      
The specific leaf density is suggested to be a structural and functional characteristic of the photosynthetic apparatus of agricultural plants.
      
The methods for obtaining microbiological transformation products of household, agricultural, and industrial waste and their characteristics are analyzed.
      
The distinctions between these strains in physiological and biochemical characteristics and the ranges of their bactericide action on the microorganisms capable of developing in agricultural materials and food products were determined.
      
Organization of the paper scheme-based wholesale fertilizer supply was suggested as one of the effective means of supporting the agricultural branch which is in prolonged depression.
      
This part of the review summarizes new data on the radiation-chemical purification of municipal, industrial, and agricultural wastewater; liquid radioactive wastes; oils; etc.
      
The method was applied to real samples such as sewage, agricultural soil and Persian golf shrimp.
      
 

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