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Variation characteristics of agricultural heat resource and its effect on agriculture in Shanxi Province, China. Effects of cropping patterns on photosynthesis characteristics of summer maize and its utilization of solar and heat resources. Analysis and assessment of heat resource for winter wheat northward moving during 1961-2001 in Shaanxi Province Impact of climate warming on temperature and heat resource in arid Northwest China Characteristics of heat resource in mountainous region of northern Guangdong, South China based on three-dimensional climate observation. Potential Productivity of Light and Heat Resources and Its Utilization in Winter Wheat Field