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Peng S.-Z.,Hohai University | Gao X.-L.,Hohai University | Yang S.-H.,Hohai University | Yang J.,Guizhou Academy of Hydraulic science | Zhang H.-X.,Guizhou Academy of Hydraulic science
Water Science and Engineering | Year: 2015

he water requirement pattern for tobacco (Yun 85) was identified based on analysis of data obtained from pot experiments in a canopy at the Xiuwen Irrigation Test Central Station in Guizhou Province, China. The results showed that the tobacco water requirement and the tobacco water requirement intensity throughout the growth period in pot experiments were significantly lower than those in field production. In pot experiments, the tobacco water requirement throughout the growth period ranged from 159.00 to 278.90 mm, with a reduction in the range of 241-441 mm, as compared with that in field production. Also, the average water requirement intensity at the vigorous growing stage was 1.97 mm/d, and the water requirement and water requirement module were 33.80-72.60 mm and 16.39%-33.09%, respectively, at the group stage, almost equal to their values at the vigorous growing stage. The patterns of the tobacco water requirement and water requirement module in pot experiments were different from those in field production. In pot experiments, the tobacco water requirement and water requirement module ranked the highest at the mature stage, followed by those at the group/vigorous growing and rejuvenation stages, while the water requirement intensity ranked the highest at the vigorous growing stage, followed by those at the mature, group, and rejuvenation stages. The pattern of the water requirement intensity in pot experiments was consistent with that in field production. In addition, the response of the tobacco water requirement to water deficit was also analyzed. Serious water deficit at the vigorous growing stage and continuous water stress at the group, vigorous growing, and mature stages can greatly influence the tobacco water requirement. Water deficit led to reductions in the water requirement and water requirement intensity at each growth stage. The vigorous growing stage exhibited the highest sensitivity to water deficit. The lower limit of moderate soil water stress at the vigorous growing stage was 65% of the field capacity. Results of this study can help to establish a reasonable irrigation schedule for tobacco production in Guizhou Province, China. © 2015 Hohai University. Production and hosting by Elsevier B.V.. Source


Zhang H.X.,ShenYang Agricultural University | Zhang H.X.,Guizhou Academy of Hydraulic science | Chi D.C.,Guizhou Academy of Hydraulic science | Wang L.X.,Guizhou Academy of Hydraulic science | And 2 more authors.
Advanced Materials Research | Year: 2013

In this paper, the fuzzy controlling system of automatic irrigation was prepared and designed based on MINI2440 and C8051F410 MCU, in which MATLAB was embedded in C8051F410 MCU while WINCE5.0 was embedded in MINI2440. In the progress, the WINCE5.0 was developed by using C#. All the simulate results of fuzzy controller were shown by SIMLINK in the system. In this paper, we proposed a novel control mode and gave the Robust Control Algorithm of the fuzzy Control System. © (2013) Trans Tech Publications, Switzerland. Source


Zhang H.-X.,ShenYang Agricultural University | Zhang H.-X.,Guizhou Academy of Hydraulic science | Chi D.-C.,ShenYang Agricultural University | Wang Q.,Guizhou Academy of Hydraulic science | And 2 more authors.
Agricultural Sciences in China | Year: 2011

The aims of this research were to compare subsurface drip irrigation scheduling and nitrogen fertilization rates in cucumber, and evaluate yield and quality of cucumber fruit, water (WUE), irrigation water (IWUE), and nitrogen use (NUE) efficiencies in the solar greenhouse in Southwest China. The irrigation water amounts were determined based on the 20 cm diameter pan (E p) placed over the crop canopy, and cucumber plant was subjected to three irrigation water levels (I1, 0.6 E p; I2, 0.8 E p; and I3, 1.0 E p) in interaction with three nitrogen fertilization levels (N1, 300 kg ha -1; N2, 450 kg ha -1; and N3, 600 kg ha -1). The results showed that the cucumber fruit yield increased with the improvement of irrigation water. Irrigation water increased yields by increasing the mean weight of the fruits, and also by increasing fruit number. But the highest values of IWUE and WUE were obtained from I2 treatment. NUE significantly decreased with the improvement of N application, but increased by irrigating more water. The quality of cucumber fruit decreased with the improvement irrigation water and nitrogen fertilization. In conclusion, the optimum irrigation level and nitrogen fertilizer application level for cucunber under subsurface drip irrigation in the solar greenhouse in Southwest China were 0.8 E p and 450 and 600 kg ha -1, respectively. © 2011 Chinese Academy of Agricultural Sciences. Source

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