|
Grafted seedlings to 3-year-old Lizao year pot experiment, experiment on April 16, 2010 (transplant) to October 31 (deciduous). Jujube entire growth period can be divided into budding leaf expansion, flowering - fruit set, fruit enlargement of fruit maturity and defoliation five growth stages. In this paper, the first four stages, Experimental study on the basis of trials with major climatic factors and growth indicators jujube under normal growth conditions (growth of new shoots, jujube tree diameter, leaf area index) and physiological indicators (photosynthetic rate, net photosynthetic rate, transpiration rate, stomatal conductance) as jujube quality measurement standard, the key findings are as follows: (1) a jujube tree throughout the growing period of about 154d, different water treatments soil water dynamics monitoring results indicate that CK treatment 1 , treatments 2 and 3, the average daily water consumption were: 5.6mm / d, 4.9mm / d, 4.4mm / d and 4.1mm / d. The jujube stage water consumption, respectively: 870mm, 762mm, 686mm and 641mm. (2) the jujube tree flowering fruit set and fruit enlargement period during different water treatments Pn and Gs Day change under normal conditions showed a single peak curve, WUE in the determination of instantaneous date change for the day was high in the morning while the afternoon low trend curve. (3) in Regulated Deficit state, the processing of the whole growth jujube average daily water consumption was significantly lower than the consumption of the control soil moisture; the jujube tree new growth and trunk diameter slightly increase the growth rate compared with the control are has slowed down; with soil moisture smaller, the slow growth rate of leaf area branches reduce the number of single leaf area on each branch level also decreases; number of different treatments buds over time showed the trend first increases and then decreases, and peaked on July 2. With the decrease of soil moisture jujube tree flowering also will be shortened. (4) through the year potted jujube test, preliminary draw jujube water requirement rules: the budding leaf expansion, flowering fruit set, fruit enlargement and fruit maturity water demand were: 82 m to 3 / 667m ~ 2,205 m ~ 3/667m ~ 2,133.4 m ~ 3/667m ~ 2 and 92m ~ 3/667m ~ 2. The water demand strength, respectively, for 4.1mm / 5.8mm / d, 5.0mm / d and 4.6mm / d. (5) experimental study found, jujube the budding leaf expansion and fruit ripening, soil suitability weight moisture content of 15.2 to 19.8%; flowering fruit set and fruit enlargement of soil suitable for the weight of the water content was 15.2 to 22.1%. (6) by the year pot experiment, we can draw the whole growth stage of the jujube tree water demand for 686 to 762mm budding leaf expansion and fruit ripening take the lower limit of the irrigation cycle for 10d, irrigation times, 3 to 4 times; flowering fruit set and fruit enlargement period to take maximum irrigation cycle 5d, irrigation times, 5-6 times, irrigation 18 times throughout the growing period. In summary, under normal circumstances, jujube during flowering and fruit setting irrigation 2 fruit enlargement of irrigation. However, the rain distribution needs, depending on the year timely irrigation, general Year jujube tree sprout leaf expansion and fruit ripening, when the weight of the soil moisture content of less than 10.2% (accounting for 65% of field capacity), required irrigation A light water.
|