Most of the agriculture is rain-fed, and with lack of rain, crop yields are poor.

这里的大部分农业靠降雨维持，如果缺乏降雨，庄稼的收成就很差。

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Under the B2 scenario of no CO2 fertilization and crop system change, the yield of rain-fed and irrigated maize will separately decrease 2% and 14.3% in 2070s.

在不考虑CO_2肥效作用和种植制度变化的B2情景下，未来我国雨养和灌溉玉米产量分别下降2%和14.3%。

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Submergence and drought are major constraints to rice (Oryza sativa) production in rain-fed farmlands, both of which can occur sequentially during a single crop cycle.

对于水灌溉农田而言，涝害和干旱是水稻产量的主要限制因素，并且涝害和干旱胁迫可以在同一季水稻生产过程中相继发生。

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