2 The map on the title page shows the crop production value of China's cultivated land in Yuan per hectare (Reproduced from: Heilig, 1999). The map shows that there are great divergences in crop productivity between cultivated areas in China. Very " profitable " crop production is possible in the provinces of Hubei, Hunan and parts of Jiangsu. A very poor crop production value is generated in t...

Good management models for postemergence weed control require good estimates of which weed density produces an economic threshold yield. Because intraweed competition increases if weeds are aggregated, weed spatial pattern may be an important factor for inclusion in management models. Mathematical models of weed–crop competition have demonstrated that this may be the case, but the small number ...

abstract the present study was carried out for developing and evaluating of the optimization model of cropping pattern in irrigation networks using analytical hierarchy process (ahp). the model was programmed into two sub-models. the objective of the first sub-model was ranking of crop appropriately, and the objective of the second sub-model was ranking of cropping area of each crop. ten criter...

For assessment of organic matter input into the soil system information on the elements of primary production by overlying vegetation is quiet essential. Hence the primary objective in this study was to investigate the primary production and organic matter input into the study sites and to estimate the organic matter. Total below ground and above ground ratio was 4.68:1 and 4.94:1 in organic an...

an analysis of the stages of crop growth presents an important step in the improvement of production management. through growth analysis, planning for planting systems, fertilization, pruning operations, harvest time as well as obtaining economical yield can be more accessible. therefore, a development of mathematical models simulating plant growth would be helpful in improving crop management,...

In this study a research, there was conducted on the change regarding the climatic parameters oftemperature and rainfall along with their sequential quantitative changes in the province Khouzestan.Then the economic effect on water use and the net income of wheat, was assessed by applyingRicardian method. The results of the statistical analysis using Mann-Kendall test proved the existenceof the ...

In the desert locust, Schistocerca gregaria, the frontal ganglion (FG) plays a key role in control of foregut movements, and constitutes a source of innervation to the foregut dilator muscles. In this work we studied the generation and characteristics of FG motor outputs in two distinct and fundamental behaviours: feeding and moulting. The FG motor pattern was found to be complex, and strongly ...

Powdery mildew disease of beans in India causes major economic losses in agriculture. For sustainable agriculture, detection and identification of diseases in plants is very important. In this review, we are trying to identify the powdery mildew disease of beans crop by using some image processing and pattern recognition techniques and comparing with molecular and spectroscopic techniques. Earl...