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Study on Physiological and Ecological Characteristics of Rice under Different Irrigation Methods

Author: DengHuan
Tutor: CaoCouGui
School: Huazhong Agricultural University
Course: Crop Cultivation and Farming System
Keywords: Rice Irrigation methods Biological characteristics Rice population characteristics Paddy environmental characteristics
CLC: S511
Type: Master's thesis
Year: 2006
Downloads: 350
Quote: 1
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Abstract

To the hybrid rice Liangyoupeijiu Honglianyou the 6th field plots and measured pit two different range level cultivation test conditions, compared intermittent irrigation, semi-arid cultivation of rice under dry cultivation and flood irrigation biology characteristics of the paddy fields and environmental characteristics. The results show that: (1) each treatment) showed some differences at different growth stages of actual water consumption, water strength and modulus than coefficient (stage water consumption as a percentage of total water consumption. Flood irrigation water consumption average of 538.60mm; intermittent irrigation 491.45mm, accounting for 91.25% of the flood irrigation; semi-arid cultivation accounted for 82.04% of the flood irrigation; drought cultivation of actual water consumption accounts for only flooding irrigation 70.31 %. The whole rice growth season, the average water consumption intensity flooding> intermittent> semi-drought> Drought, respectively 5.04mm · d ^{-1 4.77 mm · d ^{-1 4.21mm · d ^{-1 and 3.54mm · d ^{-1 . Compared with flood irrigation, leaf photosynthetic rate under intermittent irrigation conditions, leaf area index, leaf transpiration rate is low, to improve water use efficiency of the WUE (WUE = Pn / Tr); under conditions of semi-arid cultivation of rice leaf transpiration fall faster rate than the rate of net photosynthesis, water use efficiency is relatively high; reduce net photosynthetic rate under dry cultivation, water use is low, and late leaf senescence. ③ intermittent rice irrigation water use efficiency (yield per hectare / per hectare of water consumption, the contribution rate of the unit volume of water production) and the highest yield half as early cultivation under rice production is slightly lower than flood irrigation, but its water consumption, water use efficiency was significantly higher than flood irrigation; were significantly lower water use efficiency and yield of dry cultivation rice. Different ways of irrigation water use efficiency of the order: intermittent irrigation 2.10 ± 0.15Kg · m ^{-3 semi-dry cultivation 1.78 ± 0.04Kg · m ^{-3 flooding irrigation 1.54 ± 0.17Kg · m ^{-3 , dry cultivation 1.34 ± 0.04Kg · m ^{-3 ; intermittent irrigation water use efficiency is higher than flood irrigation 35.90 %, 56.72% higher than the dry cultivation. ④ rice growth period between the different irrigation methods showed significant differences. With the field irrigation reduction in the amount of delayed fertility. Growth period the number of days the longest drought waterlogged whole growth period days gap up to 13.5 days. ⑤ intermittent irrigation conditions under rice grain milled rice rate, milled rice rate, grain length than other treatments, chalky grain rate, chalkiness lower than the other treatments: rice amylose content decreased with the reduction in rice paddy water consumption, gel consistency, alkali spreading value and protein content increased. (6) in the whole growth period, different the irrigation the way rice paddies groups environment are demonstrated: canopy temperature and light traits and leaf area index, plant height, number of effective tillers was highly significant negative correlation canopy traits and leaf area index relative humidity, strain high, the effective number of tillers highly significant positive correlation. ⑦ field environment of different irrigation methods are demonstrated: the maximum temperature and minimum relative humidity, temperature difference between day and night, day and night humidity difference correlation coefficient close to -1, was highly significant negative correlation. The maximum temperature and minimum relative humidity of the entire growth period regression equation Y =-2.152X 130.15 each increased by 1 ° C, ie temperature, relative humidity dropped to 2.152 percent. ⑧ light transmittance of the entire growth period (canopy bottom of the PAR / incident PAR) showed the first small and then increase trend, flooded}}}}}}}}

Study on Physiological and Ecological Characteristics of Rice under Different Irrigation Methods

Abstract

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