| First, the use of Henan Province,22 counties (cities) in 1970 to 2005, meteorological data, from the basic elements of climate sunshine, temperature, precipitation, the pairs of Henan Province in recent 35 years, the characteristics of light and temperature of water resources and their development trends of the analysis and evaluation of, thus revealing a different latitude regions of Henan Province under the agro-climatic conditions, ecological environmental change and its impact on agriculture.Henan Province in recent 35 years (1970-2005 years) to the number of hours sunshine of wheat volatile; average annual sunshine percentage, Jun Cheng clear downward trend.Henan Province, the average annual temperature of an upward trend, from 14.3℃to 70 age 2005 14.6℃,35-year increase of 0.3℃, the coefficient of variation 3.4%; in central Henan Province, Zhengzhou and Xinxiang increased considerably, reaching more than 1℃, increase in other regions were 0.6℃below. Between inter-annual changes in the larger area is north of Anyang, coefficient of variation up to 4.1%, other regions in less than 4%.Between inter-annual changes in precipitation in Henan Province from the 80's began to become larger, but no significant trend, the average fluctuation in the 730mm or so, considerable variation between inter-annual variation coefficient 22-33%, which is affecting crops and stable yield important one of the factors. The distribution of precipitation was decreasing trend from south to north, south Xinyang highest in the north Anyang, Xinxiang and western Sanmenxia lowest in the region. Greater inter-regional differences in precipitation, northwest of Anyang, Xinxiang, Sanmenxia annual rainfall from the early 70s more than 620mm down to "15" period of 550mm, while the central and southern Taiwan in the 800-1000mm annual rainfall of Xuchang, Zhumadian and other regions showed higher annual rainfall trend in the north with the national pattern of increased floods and droughts in the South are basically the same.Wheat production in Henan Province from 2004, after steadily increasing year by year, in addition to government policy support, efforts to strengthen scientific and technological support, the growth period of wheat in recent years with plenty of natural resources, no major disasters related to weather there.Second, through analysis and comparison of agricultural experts, select 3 for the natural production potential for maize and wheat in Henan Province computing model. According to the selected evaluation model to calculate the various regions of Henan Province of wheat production potential of photosynthesis, the light-temperature production potential and climatic production potential. The results showed that: In view of Henan Province to improve wheat production in different latitudes of the way to north-central regions to select high-yielding varieties, the development of artificial irrigation, and give full play to the resource potential of the area light and temperature to further improve light utilization in the southern region should give full play to precipitation potential, to adjust the layout of the development of rain-fed agriculture to improve water use efficiency.Third, through the 2007-2008 testing in Henan Province,22 points (latitude 32°～36°) with a representative selection of six of the semi-winter wheat varieties and the weak spring set planting experiment was conducted at different latitudes in Henan Province eco-environmental conditions, wheat, light and temperature status of water resources, as well as variety, sowing date and density on wheat yield and improve the potential of light-temperature water to use way. The results showed that: Henan Province, with different gluten types of semi-winter and the weak spring wheat varieties, with the latitude to reduce the output showed increasing trend. Specific indications were:Chi Mai 20 (strong gluten cultivars) at different latitudes of the output of each treatment in order to 32°-33°latitude regions of low-density early seeding treated as the highest Yumai 49-198 (in bars varieties) at different latitudes the output of each treatment to 34°-35°latitude regions in the density of suitable sowing treated as the highest, Zhengmai 004 (weak gluten varieties) at different latitudes of the output of each treatment in order to 33°-34°latitude regions of the low-density early seeding treated as a maximum; Zhengmai 9023 (strong gluten cultivars) at different latitudes of the output of each treatment in order to 33°-34°latitude regions of high-density Late Sowing treated as the highest Yan Exhibition 4110 (in gluten varieties) of each treatment at different latitudes production to 33°-34°latitude regions of high-density Late Sowing treated as the highest Yumai 50 (weak gluten varieties) at different latitudes of the output of each treatment in order to 32°-33°latitude regions of the low-density treatment for early seeding maximum.
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