The influence of water and fertilizer coupling on physiological change and yield of dwarf dense planting jujube under drip irrigation

In order to investigate effect of water and fertilizer coupling on the physiological changes and yield quality of dwarf dense planting jujube under the drip irrigation in Hami area, the physiological indexes including stomatal conductance, photosynthetic rate and transpiration rate of jujube were monitored with automatic portable photosynthesis for three consecutive years in this study. The results showed that under the same drip irrigation, the effect of fertilization on the transpiration rate was not obvious. Under the same fertilization, the increase of irrigation could effectively promote the transpiration rate. At the 900 mm amount of irrigation, photosynthetic rate could be effectively enhanced by fertilizor. When the amount of fertilizer was increased to 1500 kg · hm^-2, the photosynthetic rate could be inhibited by fertilizer and produced antagonistic effect. When the irrigation quota was 900 mm and the fertilization amount was 1500 kg · hm^-2, the photosynthetic rate and yield could reach the maximum value, which was higher than yield of low-waterhigh-fertilizer treatment and low-fertilizer-high-water treatment increased by 31%, 24%, 27% and 1.9%, 0.3%, 0.7%, respectively. The results showed that under this irrigation system, the water and fertilizer efficiency and the economic benefit of jujube reached the highest level. The study can provide a scientific basis for the management of water and fertilizer of drip dwarf dense planting jujube in Hami area. (authors)