Scientia Agricultura Sinica ›› 2020, Vol. 53 ›› Issue (22): 4550-4560.doi: 10.3864/j.issn.0578-1752.2020.22.003

• TILLAGE & CULTIVATION?PHYSIOLOGY & BIOCHEMISTRY?AGRICULTURE INFORMATION TECHNOLOGY • Previous Articles     Next Articles

Effects of Different Cultivation Modes on Canopy Structure and Photosynthetic Performance of Summer Maize

LI Jing,WANG HongZhang,XU JiaYi,LIU Peng(),ZHANG JiWang,ZHAO Bin,REN BaiZhao   

  1. College of Agriculture, Shandong Agricultural University/State Key Laboratory of Crop Biology, Taian 271018, Shandong
  • Received:2020-01-19 Accepted:2020-06-30 Online:2020-11-16 Published:2020-11-28
  • Contact: Peng LIU E-mail:liup@sdau.edu.cn

Abstract:

【Objective】This experiment studied the differences in the canopy characteristics, ear position leaf chloroplast structure and photosynthetic performance of summer maize in different cultivation modes. To illuminate the regulation effect of cultivation patterns on canopy structure, leaves development and photosynthetic performance and provide theoretical basis for further construction of high-yield summer maize cultivation model with high efficiency canopy structure.【Method】The experiment was conducted in Taian, Shandong province in 2018 and 2019, with Denghai 605 as the experimental material. Through the comprehensive optimization of planting density, fertilizer management and planting methods, two optimized cultivation patterns were performed, including super-high-yield cultivation mode (SH) and high-yield and high-efficiency cultivation mode (HH), with the local farmer management mode (FP) as a control. The differences of summer maize canopy structure, ear position leaves chloroplast structure and net photosynthetic rate between the three cultivation management modes were compared. 【Result】Compared with FP, the upper leaves of SH and HH had smaller stem-leaf angle and larger leaf orientation value, their middle and lower leaves were well developed, and they had higher leaf area index (LAI) and higher LAI duration. SH and HH middle leaves light interception rate increased significantly compared with FP, with increasing by 21.64% and 12.63%, respectively. Also, SH and HH formed a suitable population canopy structure. The chloroplast structure of SH and HH was well developed, while that of FP was relatively stunted. Compared with FP, SH and HH had better development and more number of thylakoids. The thylakoid in chloroplast of FP developed relatively poorly, which had higher percent of undeveloped thylakoid as well as fuzzy and unevenly arranged stromal sheets. The net photosynthetic rate of ear leaves at the silking stage had a trend of SH>HH>FP. Dry matter accumulation and grain yield had similar trend. Compared with FP, SH and HH increased grain yield by 14.20% and 4.91%, respectively.【Conclusion】Compared with FP, SH and HH could increase grain yield, which was mainly due to the optimized population canopy structure, promoted leaves development, ensured integrity of the chloroplast structure, and significantly improved the leaves photosynthetic capacity. Compared with SH, HH applied less amount of fertilizer, formed a suitable population canopy structure, developed well leaves. Thus, HH was a cultivation mode that contributed to the use of light energy.

Key words: summer maize, cultivation mode, canopy structure, light distribution, photosynthetic performance

Fig. 1

Daily average temperature, effective photosynthetic radiation, and daily rainfall of the test site during the maize growth period"

Table 1

Density and fertilizer management"

处理
Treatment
种植密度
Planting density
(plant/hm2)
行距
Row spacing
肥料类型
Fertilizer
肥料用量
Dosage (kg·hm-2)
比例 Proportion
播种
Seeding
大喇叭口
V12
开花
VT
乳熟
R3
SH8250080+40 cm有机肥
Organic fertilizer
7500100%
N54030%PU+10%U30%U20%U10%U
P2O5180100%
K2O36075%25%
HH8250060+60 cm有机肥
Organic fertilizer
7500100%
N22530%PU+10%U30%U20%U10%U
P2O5150100%
K2O30075%25%
FP6750060+60 cm种肥同播三元复合肥(N-P2O5-K2O=14-16-15)750 kg·hm-2
Ternary compound fertilizer (N-P2O5-K2O=14-16-15) 750 kg·hm-2

"

年份
Year
处理
Treatment
茎叶夹角 Stem-leaf angle (°)叶向值 Leaf orientation value
上层 Upper leave中层 Middle leave下层 Lower leave上层 Upper leave中层 Middle leave下层 Lower leave
2018SH17.17ab24.01a25.35b69.72a62.51a54.08ab
HH16.58b19.75b23.17b69.59a61.64ab59.22a
FP18.02a24.81a28.24a67.67b59.02b48.20b
2019SH11.88ab27.5ab33.7c75.41a54.57a46.57a
HH11.13b23.33b32.0c73.77ab54.17a44.86ab
FP12.58a29.08a41.87a70.57b51.51ab33.83c

Fig. 2

Changes of leaf area index of populations in different cultivation modes at different growth stages V6, V12, R1, R1+30 and R6 represent jointing stage, 12 leaves stage, silking stage, 30 days after silking stage and maturation stage of summer maize.* and ** indicate significantly different at P < 0.05 and P < 0.01, respectively, ns: No significance"

Fig. 3

Vertical distribution of canopy structure of summer maize during silking stage under different cultivation modes Different small letters indicate significantly different between treatments at P < 0.05"

Fig. 4

Light energy interception rate of different cultivation modesU: Upper leaf layer; M: Middle leaf layer; D: Lower leaf layer. Bars superscripted by different small letters are significantly different between treatments at P < 0.05. The same as below"

Fig. 5

Development of leaf chloroplasts in different cultivation mode populationsCM: Chloroplast membrane; GL: Grana lamella; SL: Stroma lamella. A, B, and C are the super-high-yield mode, high-yield and efficient mode, and farmer management mode in 2018. D, E, and F are the super-high-yield mode, high-yield and efficient mode, and farmer management mode in 2019"

Fig. 6

Net photosynthetic rate of panicle leaves of summer maize during silking stage under different cultivation modes"

Table 3

Dry matter accumulation and distribution ratio of summer maize before and after silking in different cultivation modes"

年份
Year
处理
Treatment
干物质积累量 Dry matter accumulation (kg·hm-2)干物质分配比例 Dry matter distribution ratio (%)
V6R1R6吐丝前 Pre-silking吐丝后 Post-silking
2018SH1842a9876a26885a36.73b63.27a
HH1793a9541b24214b39.41ab60.59ab
FP1367b9226b22486c41.06a58.94b
2019SH1358a10111a29303a34.50b65.50a
HH1210b10019a24715b40.53a59.47b
FP1193b9886a23069c42.85a57.15b

Table 4

Grain yield and yield components under different cultivation modes"

年份
Year
处理
Treatment
单位面积穗数
Ear number (ear·hm-2)
穗粒数
Grains per ear
千粒重
Thousand kernel weight (g)
产量
Yield (t·hm-2)
2018SH78495a513.5ab372.5b12.7a
HH74610a502.2b369.8b11.8b
FP64478b547.3a385.1a11.6b
2019SH82560a474.4b377.8c13.2a
HH79892b454.2c384.5b12.0b
FP67336c497.7a389.9a11.1c
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