Specifications

2 Key Laboratory of Water-Saving Agriculture of Henan Province, Farmland Irrigation Research
Institute, Chinese Academy of Agricultural Sciences, Xinxiang 453003, China
Corresponding author: Feng, J. ([e-mail])
Source title: Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural
Engineering
Abbreviated source title: Nongye Gongcheng Xuebao
Volume: 29
Issue: 4
Issue date: February 15, 2013
Publication year: 2013
Pages: 87-94
Language: Chinese
ISSN: 10026819
CODEN: NGOXEO
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South,
Beijing, 100026, China
Abstract: An adaptive drip irrigation emitter is a new type of emitter which uses the multi-use
function of flow compensation and the flow adaptive. In order to examine the effect of
self-adjustment automatically on an adaptive drip irrigation emitter, we studied the hydraulic
performance of the type of AD-1 adaptive drip irrigation emitter under two different operating
modes of the flow compensation and the flow adaptive according to the working mechanism of
the adaptive drip irrigation emitter by using the negative pressure suction pump to simulate the
soil suction. The tests examined the flow rate uniformity, the relation between the supply water
pressure and drip flow, and the relation between simulated soil negative pressure and drip flow
on the adaptive drip irrigation emitter which the simulated soil negative pressure was formed by
suction pump. At the same time, we had analyzed the suitable supply water pressure. The results
showed that: the adding of drip state control structure not only retained the general flow
compensation characteristic of drip irrigation emitter, but also added in advantages including
multi-use functions of soil moisture monitoring, intelligent controlling irrigation and automatic
adjustment of drip flow. At the mode of flow compensation, the flow rate of emitter was 14.71
L/h, the coefficient of uniformity was higher, the coefficient of flow deviation was 9.79% when
the supply water pressure was rated 100 kPa. At the mode of flow adaptive, the emitter can
begin working normally when the two pressures were acting together, and when the supply
water pressure was only 30 kPa and the minimum soil suction of 20 kPa. The coefficient of flow
uniformity also stayed steady. Then we determined the minimum and the maximum suitable
water supply pressure was 30 and 50 kPa respectively. Moreover, it can adjust the drip flow rate
automatically and in a timely manner at the range of 0-11.22 L/h according to the actual soil
moisture status at the range of suitable water supply pressure 30-50 kPa. Unlike conventional
irrigation emitters, the adaptive drip irrigation emitter can better change the working mode of
dripping water passively and the technology of the irrigation system was improved to the level of
accurate and precision irrigation, and achieved the aim of fetching water initiatively according to
the needs of the crop and soil. Therefore, all of above characteristics are not only ensuring the
supply of the suitable soil moisture during the normal growth of a crop, but also promoting the