Climate change is expected to alter species distribution and habitat composition, with wild being particularly vulnerable. Gossypium aridum, a cotton in Mexico, has shown decrease extent population; however, the data are not precise. The objectives of this study are: (1) develop model G. aridum (2) identify areas environmental conditions similar where currently maintains populations, (3) determ...

Identifying the growth stages on oilseed rape accurately is essential for effective crop management. Two commonly used methods identifying are growing degree days (GDD) and BBCH scale, by measuring heat accumulation daily temperatures describes of plants. The main goal this research using a combination these methods, where can identify in production period. three-year field experiments 2015/16 ...

aphids in unsprayed canola (brassica napus linnaeus) fields in isfahan province (central iran) were sampled for two growing seasons, 2011-2013. sampling unit was a whole plant and 20 plants were sampled weekly. in the laboratory, heat-extracting and sub-sampling techniques were used to estimate the density of aphids. to determine the relationship between population growth rate of the aphids and...

So far, various methods have been presented for determining reference crop evapotranspiration in different parts of the world. The most popular and prestigious of them are probably the combined methods of Penman family, modified Blany-Criddle, Hargreaves - Samani and thornthwaite. Due to lack of lysimeter data in many parts of Iran, presenting an equation according to the regional condition wit...