Abstract
To improve the drought resistance of dryland wheat, the effects of different amount of water retaining agent on chlorophyll content (SPAD), net Photosynthetic rate (Pn), stomatal conductance (Gs), intercellular CO 2 Concentration (Ci) and Transpiration rate (Tr) of dryland wheat were studied with Jimai 22 as experimental material. The results showed that, under conditions of this experiment, when the amount of water retaining agent was in range of 0-1 kg·667 m -2 , with the increase in the amount of water retaining agent, the chlorophyll content (SPAD), net Photosynthetic rate (Pn), stomatal conductance (Gs) and Transpiration rate (Tr) in dryland wheat increased and the intercellular CO 2 Concentration (Ci) decreased; while the amount of retaining agent was in range of 1-2 kg·667 m -2 , with the increase in the amount of retaining agent, chlorophyll content (SPAD), net Photosynthetic rate (Pn), stomatal conductance (Gs) and Transpiration rate (Tr) of dryland wheat decreased and intercellular CO 2 Concentration (Ci) increased. The best application amount of water retaining agent was 1 kg·667 m -2 .
Highlights
Water has become critical resources constraint to China's agricultural safety in production due to the shortage of water resources of China and the unevenness distribution of spatial and temporal of geographically, so that to develop the efficient watersaving agriculture is the only way for Chinese agricultural sustainable development
In heading, flowering and grain filling stage of wheat, treatment T2 increased the chlorophyll content of dryland wheat significantly which was conducive to the absorption of light energy and the accumulation of photosynthetic products
The Photosynthetic rate (Pn) of dryland wheat under different treatment was in the following sequence: T2>T3>T4>T1>CK
Summary
Water has become critical resources constraint to China's agricultural safety in production due to the shortage of water resources of China and the unevenness distribution of spatial and temporal of geographically, so that to develop the efficient watersaving agriculture is the only way for Chinese agricultural sustainable development. Water retaining agent is the polymer compound granules, known as the soil water, high water-absorbing agent, moisturizing agent, polymer water-absorbing agent, which is in use of strongly water-absorbent resin with high water absorption water retention capacity (Zhang and Bai, 2012). It can absorb the water into the hundreds even thousands of times the equivalent of its own weight. Water retaining agent has the capacity of repeatedly absorbent and releasing water It swelling to gel after absorbing, with slow release of water which is absorbed by crops, will enhance soil water retention and reduce water deep leakage and loss of soil nutrients and improve water use efficiency. Water retaining agent's ability to retain water, nutrients and characteristics to improve physical structure of the soil will provide good conditions for the crop growth and nutrient absorption of underground portion and lay a solid foundation for the normal growth of crops aboveground
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