DOI: 10.3724/SP.J.1006.2008.00653

Acta Agronomica Sinica (作物学报) 2008/34:4 PP.653-661

Bending Mechanical Properties of Stalk and Lodging-Resistance of Maize (Zea mays L.)

High plant density is one of the cultivation measures for high yield in maize production, but may risk lodging during the growing period. The occurrence of lodging is highly related to stalk mechanical intensity in addition to plant height and stalk diameter. Some investigators have measured the indices of stalk intensity in maize, but we believe that the knowledge on bending properties of maize stalk will give more mechanical explanation to lodging-resistance. In the present experiment, we employed three maize cultivars, Denghai 3719 (high density-tolerant and lodging resistant), Jingke 519 (low density-tolerante and lodging resistant), and Nongda 108 (moderate density-tolerant), and used universal hydraulic test equipment to investigate the Yong's modulus and the bending strength of stalk under five densities (3.00, 5.25, 7.50, 9.25, and 12.00 × 104 plants ha-1, respectively). The basal 1st to 8th internodes of 3-8 plants from each treatment were sampled at pre-tasselling and dough stages, respectively. The parameters of stem morphologic trait showed thinned internode diameter and longer internode at basal stem accompanying with the increasing of maize planting density in all three cultivars, in which Denghai 3719 had the smallest values (internode diameter and length). The moment of inertia of maize stalk varied among cultivars and among internodes, and close related to internode diameter. The Yong's modulus and bending strength of maize stalk increased in the process of growth period, but decreased significantly with the increasing of planting density and the rising of internode position. The Yong's modulus and the stalk bending strength on the average of the 3rd and 5th internodes were 72.32 MPa and 4.05 MPa in Denghai 3719 at pre-tasselling stage, while only 42.31 MPa and 2.80 MPa in Jingke 519 which were the stalk broken thresholds in high densities (7.5–12.0 × 104 plants ha-1).They went up by 100.8% and 129.3% in Denghai 3719 and 59.1% and 105.7% in Jingke 419, respectively at dough stage. The results imply that the probable critical parameters of stalk broken are 40.0 MPa for Yong's modulus and 2.8 MPa for maximum bending strength at basal internodes at pre-tasselling stage in maize. The Yong's modulus of stalk was significantly correlated (P<0.01) with the bending strength. While the diameter of internodes was positively correlated (P<0.01) with Yong's modulus and bending strength of stalk at pre-tasselling stage, but not at dough stage. They were negatively correlated at P<0.01 with field lodging percentage. The Yong's modulus could reflect the ability of tolerance to high densities of stalk, and the bending strength of stalk to lodging resistance, however, the diameter of internodes was not a good indicator for evaluating stalk mechanical strength. The bending mechanical properties of different cultivars under different planting densities showed similar trends at pre-tasselling and dough stages, indicating the possibility of selection and evaluation for lodging-resistant maize cultivars at early developmental stage.

Key words:Maize stalk,Bending experiment,Yong's modulus,Bending strength,Planting density

ReleaseDate:2014-07-21 14:20:50

[1] Tollenaar M, Lee E A. Yield potential, yield stability and stress tolerance in maize.Field Crops Res,2002,88:161-169

[2] Sun S-X(孙世贤). The survey of America corn yield contest in 2002.J Maize Sci(玉米科学),2003,11(3):102 (in Chinese)

[3] Liu Z-Q(刘志全), Lu L-P (路立平), Shen H-P(沈海波), Gao M(高明), Wang Z-G(王志刚). Introduction on America corn yield contest.J Maize Sci(玉米科学),2004,12(4):110-113 (in Chinese with English abstract)

[4] Zuber M S, Grogan C O. A new technique for measuring stalk strength in corn.Crop Sci,1961,1:378-380

[5] Norberg O S, Mason S C, Lowry S R. Ethephon influence on harvestable yield, grain quality, and lodging of corn.Agron J,1988,80:768-772

[6] Sun S-X(孙世贤), Dai J-Y(戴俊英), Gu W-L(顾慰连). Effects of plant density on stalk lodging and yield in maize.J Shenyang Agric Univ(沈阳农业大学学报),1989,20(4):413-416 (in Chinese)

[7] Beck D L, Darrah L L, Zuber M S. Effect of sink level on root and stalk quality in maize.Crop Sci,1987,28:11-18

[8] Li Y-J(李义钧). Study on stem lodging of maize intercropping.J Beijing Agric Sci(北京农业科学),1984,(4):11-16 (in Chinese)

[9] Li Y-Z(李永忠). The survey of study on stem and root system of maize.Agronomy Overseas—Maize(国外农学——玉米),1990,(2):5-9 (in Chinese)

[10] Zuber M S, Colbert T R, Darrah L L. Effect of recurrent selection for crushing strength on several stalk components in maize.Crop Sci,1980,20:711-717

[11] Zuber M S, Kang M S. Corn lodging slowed by sturdier stalk.Crop Soils,1978,30:13-15

[12] Anderson B, White D G. Evaluation of methods for identification of corn genotype with stalk rot and lodging resistance.Plant Dis,1994,78:590-593

[13] Kang M S, DinA K, Zhang Y D, Magari R. Combining ability for rind puncture resistance in maize.Crop Sci,1999,39:368-371

[14] Dudley J W. Selection for rind puncture resistance in two maize population.Crop Sci,1994,34:1458-1460

[15] Jia Z-S(贾志森), Bai Y-X(白永新). Identification of lodging resistance in inbred lines corn.Crop Genet Resour(作物品种资源),1992,(3):30-32 (in Chinese)

[16] Li D-X(李得孝), Yuan H-Y(员海燕), Zhou L-D(周联东). Selection and estimation of indices of stem-lodging resistance in corn.J Northwest Sci-Tech Univ Agric For(Nat Sci Edn) (西北农林科技大学学报·自然科学版),2004,32(5):53-56 (in Chinese with English abstract)

[17] Dong X-H(董学会), Duan L-S(段留生), Meng F-L(孟繁林), He Z-P (何钟佩), Li Z-H (李召虎). Effects of spraying 30% DTA-6 ethephon solution on yield and straw quality of maize.J Maize Sci(玉米科学),2006,14(1):138-140, 143 (in Chinese with English abstract)

[18] Martin G C, Russell W A. Response of a maize synthetic to recurrent selection for stalk quality.Crop Sci,1984,24:331-337

[19] Li D-X(李得孝), Kang H(康宏), Yuan H-Y(员海燕). Method of crop-stem lodging resistance.J Shaanxi Agric Sci(陕西农业科学),2001,(7):20-22(in Chinese)

[20] Goodman A M, Ennos A R. The responses of field-grown sunflower and maize to mechanical support.Ann Bot,1997,79:703-711

[21] Yuan Z-H(袁志华), Feng B-P(冯宝萍), Zhao A-Q(赵安庆), Liang A-Q(梁爱琴). Dynamic analysis and comprehensive evaluation of crop-stem lodging resistance.Trans CSAE(农业工程学报),2002,18(6):30-31 (in Chinese with English abstract)

[22] Neenan M. An analysis of the problem of lodging with particular reference to wheat and barley.J Agric Sci,1975,85:495-507

[23] Wang Y(王勇), Li Q-Q(李晴祺), Li C-H(李朝恒), Li A-F(李安飞). Studies on the culm quality and anatomy of wheat varieties.Acta Agron Sin(作物学报),1998,24(4):452-458 (in Chinese with English abstract)

[24] Duan C-R(段传人), Wang B-C(王伯初), Wang P-Q(王凭青). The relationship between the structure and the property of rice stem.J Chongqing Univ(重庆大学学报),2003,26(11):30-40 (in Chinese with English abstract)

[25] Hu T(胡婷), Fu Z-Y(付志一), Jiao Q-Y(焦群英). Experimental study on the bending mechanical properties of wheat stalk.Trans CSAE(农业工程学报),2006,22(10):31-35 (in Chinese with English abstract)

[26] Li H-B(李红波), Guo Y-M(郭玉明), Chen W-Y(陈维毅). A study of the mechanical properties of winter wheat stem.J Taiyuan Univ Tech(太原理工大学学报),2006,37(1):31-37 (in Chinese with English abstract)

[27] Sun X-F(孙训方), Fang X-S(方孝淑), Guan L-T(关来泰). Material Mechanics (材料力学). Beijing: Higher Education Press, 1987 (in Chinese)

[28] Guo Q-F(郭庆法), Wang Q-C(王庆成), Wang L-M(汪黎明). China Maize Cultivation (中国玉米栽培学), 3rd edn. Shanghai: Shanghai Scientific and Technical Publishers, 2004. pp 69-73 (in Chinese)