The experiment was corducted to investigate mainly the effects of saline water(EC=2.2~4.9 dS/m) on cucumber yield,irrigation quantity and irrigation water use efficiency(IWUE) under drip irrigation in North China Plain,when the soil matric potential(SMP) at 0.2 m depth immediately under drip emitter was controlled from-10 to-50 kPa.
The results indicated that irrigation water supply and dripper discharge had extreme effects on the moisture uniformity in soil along the drip irrigation pipe direction (the direction of moist zone) for line source drip irrigation, the soil moisture uniformity would be raised with the increase of irrigation quantity and dripper discharge.
So it was reasonable for the Russian wildrye seed production that the irrigation times were four and irrigation amount was 600 m3/hm2 in Jiuquan district.
In the later stage of bearing, the stem thick of the most irrigation amount was smaller, compared to B2 and B3 .Treatment B4had the smallest stem thick.
Irrigation amount had significant effect on yield and the treatment of B2(1623.92kg/667m2), B3 (1513.91kg/667m2), B4 (1309.14 kg/667m2) and B1(1284.53 kg/667m ) was from large to small on yield.
(3) Four designed wetted percentage (78%, 56%, 39% and 26%) had no significant effects on the leaf water potential, stomatal resistance and other physiological index of almond in greenhouse under the same irrigation amount and frequency.
The commodity yield of irrigation amount as 2000ml/pot is the tallest than other treatments, and is 1 5times on irrigation amount as 1000mL/pot But compare with irrigation amount as 1500mL/pot、 2500mL/pot 、 3000 mL/pot the difference show no significance.
The correlation between forage yield and branch numbers was extremely low. Increasing irrigation rate(1 000 m3/hm2)and fertilizing rate(P2O5 360 kg/hm2+ K2O 90 kg/hm2)could get more branches and higher forage yield for the no P fertilizer and irrigation pasture.
During the period from March 10 to June 10,1999,water drainage was stochastically simulated with the total water income being 353.8 mm(including 270mm irrigation rate). The accumulated quantities of the water drainage ranged from 23.73 mm to 64.73 mm in the soil profile 2 m in depth,accounting for about 8.8% and 24.0% of the irrigation rate during this period.
hm-2 nitrogen rate. NO3--N concentration and accumulation in soil of maize strip increased obviously, and moved below 140 cm soil depth with the raise of irrigation rate.
The water movement and salt transfer in the soil under different irrigation volume and fertilization volume were studied with the simulation model through the field experiments. The characteristics of the infiltration, salt concentration distribution, the influence of irrigation volume on the water and salt transfer processes in the soil and the quantificational relation between characteristics of water and salt coupling transfer were analyzed.
As irrigation volume increased, moving distances in horizontal and in leakage depths in vertical of water increased, and the change distance in horizontal is more obvious.
The pattern of water movement in soil under different drip irrigation volume were studied. The results showed that only when the irrigation volume reached 4 000 ml/per socket, could the water be distributed on the layer where cotton roots concentrated, and thus promote the cotton growth. When the irrigation water volume was below 4 000 ml/per socket, water using efficiency was low.
The paper briefly states the spray irrigation technology and the design calculation of urban public space, including the composition, shape and irrigation volume of spray irrigation system as well as piping hydraulic calculation, the determination and selection of pipe diameter and pump.
灌水量
irrigation quantity
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