Effect of Different Water-controlled Periods and Intensity on Grain Filling Characteristics of Rice

doi:10.7668/hbnxb.2015.S1.021

Abstract

Abstract: To study grain-filling characteristics of rice in different water-controlled periods and intensity,superior and inferior grains characteristics of two rice cultivars (Shangyu 397 and Suijing 3) was comparatively analyzed with Richards equation W=A/(1+Be^Kt)^1/N and three water-controlled periods,i.e.1-10,11-20,21-30 days after heading and two types of intensity,i.e.at-30-35,-60-65 kPa of soil water potential.The results showed that 1-10 d after heading water-controlled treatment,regardless of water-controlled intensity,significantly reduced the 1000-grain weight of total grains,superior grains and inferior grains of two varieties,11-20,20-30 d after heading water-controlled treatment had little effect on 1000-grain weight,and had even increasing trend.Compared with 0 kPa (CK) soil water potential,when the soil water potential of-30-35 kPa,1-10 d after heading water-controlled treatment made initial grain-filling potential of superior grain of two rice varieties reduced,filling rate changed little,the grain-filling time and contribution rate of the early stage prolonged,and the grain-filling time and contribution rate of the middle and late stage shortened.The impact on the inferior grain varies with species.11-20 d after heading water-controlled treatment had significant effect on superior and inferior grains characteristics of two rice cultivars.Superior and inferior grains characteristics of Shangyu 397 had consistent performance.Filling rate was significantly decreased,the grain-filling time and contribution rate of the early stage was shortened,and the grain-filling time and contribution rate of the middle and late stage was prolonged.Superior grains characteristics of Suijing 3 showed the opposite of inferior grains.21-30 d after heading water-controlled treatment had little effect on superior grains filling characteristics of the two varieties,yet had greater effect on inferior grains filling characteristics.When water-controlled intensity increased,effect of 1-10 day after heading water-controlled treatment on superior grains and inferior grains filling characteristics grains of the two varieties was greater than that of other treatments.

Key words: Water-controlled periods, Water-controlled intensity, Rice, Grain-filling characteristics

CLC Number:

S511.01

XUE Jing-fang, CHEN Shu-qiang. Effect of Different Water-controlled Periods and Intensity on Grain Filling Characteristics of Rice[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2015, 30(S1): 112-119. doi: 10.7668/hbnxb.2015.S1.021.

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