Lodging Resistance of Rice under the Different Pattern of Water Direct-seeding Cultivation Method

doi:10.7668/hbnxb.2014.06.038

Abstract

Abstract: In recent years,cultivation area of direct-seeding rice in Jiangsu Province and nearby regions has been expanding rapidly,the stronger lodging resistance of culm is the key aspect to high yield and excellent-qualities,but the specific research on the influencing factors of lodging resistance is little in direct-seeding rice.At thirty days after heading,a field experiment was conducted with four varieties,conventional rice Changnongjing 7,super rice Nanjing 44,hybrid rice Yongyou 2638 and Yongyou 7,to investigate the differences of rice-stem lodging resistance between two direct-seeding cultivation methods,named hole seeding and seeding in drill cultivation,by measuring the morphological and physical traits of rice basal stems.Furthermore,the correlation analysis between the lodging index,breaking resistance and main culm physical characteristics were studied.The results indicated that the culm lodging resistance of rice planted with different planting methods was significantly different.In field,the lodging rate of hole seeding rice was lower than that of seeding rice in drill.Compared with seeding rice in drill,the breaking resistance of the second basal internode and third basal internode in hole seeding rice was higher,while the lodging index was lower.Plant height and gravity center height in hole seeding rice was longer with the ratio of gravity center height to plant height shorter.In hole seeding rice,length of the first and second basal internode was significantly shorter,culm inside diameter of three internodes from base was longer,and beside the first basal internode,culm outside diameter and culm wall thickness of the second basal internode and third basal internode were longer,and dry weight of unit internode of the first basal internode and the second basal internode were higher.Those culm physical traits of different type varieties were significantly different.The breaking resistance of the 1st,2nd,3rd basal internode and plant height,gravity center height,culm diameter,culm wall thickness,dry weight of culm,dry weight of unit internode and bending moment had significant or very significant positive correlation,while internodes length showed a significant or very significant negative correlation.The optimal combination of some main culm physical traits of rice was different under different planting methods.The direct reasons for lodging resistance increased in hole seeding rice were short and thick basal internodes,large wall thickness and good culm plumpness status.

Key words: Water direct-seeding rice, Planting method, Lodging resistance, Lodging index, Culm physical characteristics

CLC Number:

S513.01

XU Ke, TANG Lei, GUO Bao-wei, ZHANG Hong-cheng, HUO Zhong-yang, DAI Qi-gen, WEI Hai-yan. Lodging Resistance of Rice under the Different Pattern of Water Direct-seeding Cultivation Method[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2014, 29(6): 226-232. doi: 10.7668/hbnxb.2014.06.038.

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