Spatio-temporal variation of water requirement and meteorological impact factors of maize Shaanxi, China

To quantitatively reveal the characteristics of spatial and temporal distribution influencing factors maize water requirement in Shaanxi Province, Penman-Monteith model path analysis were used to systematically analyze interannual variation at different growth stages three climatic zones Province. And relationship between meteorological based on daily data Province for past 60 years. The results showed that during whole period decreased from 1960 1989, with a rate change −2.08 mm/a, increased 1989 2019, 0.38 −0.46 mm/a. decreases north south reproductive period. That seedling male stage are more Guanzhong, followed by least south. jointing is north, Guanzhong area maturity average temperature duration sunshine key affect have an increasing effect requirement, wind speed has but not obvious, vapor pressure relative humidity inhibiting requirement. For spring maize, promoting was gradually strengthened mean gradually. inhibitory continuously. This study can provide scientific basis management irrigation quota growing areas under similar cropping conditions.