Crops ›› 2021, Vol. 37 ›› Issue (1): 98-103.doi: 10.16035/j.issn.1001-7283.2021.01.014

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Effects of Different Irrigation Amounts and Spraying Humic Acid on Photosynthetic Characteristics and Yield of Oat

Wang Qi(), Sun Wen, Wu Junying, Liu Jinghui, Zhao Baoping()   

  1. Agricultural College, Inner Mongolia Agricultural University/Inner Mongolia Coarse Grain Engineering Research Center, Hohhot 010019, Inner Mongolia, China
  • Received:2020-04-17 Revised:2020-07-30 Online:2021-02-15 Published:2021-02-23
  • Contact: Zhao Baoping E-mail:512774967@qq.com;zhaobaoping82@163.com

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Abstract:

The purpose of the study was to clarify the effects of spraying humic acid on the photosynthetic characteristics and yield of oats under different irrigation amounts. Under the condition of rain-proof shed pond cultivation, using Mengnongdayan No.1 as the test material, three different irrigation amounts (60, 120 and 180mm), and three spraying treatments of spraying humic acid (HA), spraying water (WT) and no spraying (CK) at booting stage and flowering stage were set to analysis and determine the plant morphology, photosynthetic parameters, yield components, and other indicators. The results showed that under 60mm and 120mm irrigation rates, HA treatment significantly increased plant height, leaf area per plant, stomatal conductance (Gs), net photosynthetic rate (Pn), and transpiration rate (Tr) (P < 0.05). The CO2 concentration (Ci) decreased, the increase of each index under 60mm irrigation amount was higher than that of 120mm; Pn increased by 43.4% and 36.3% on average, leaf area per plant increased by 54.3% and 34.7% on average (P < 0.05); Grain yield of HA treatment significantly increased under 60mm and 120mm irrigation amounts by 22.7% and 18.0%, respectively. Ear length and grain number per panicle increased significantly (P < 0.05); while WT treatment had no significant effects on morphology, photosynthetic parameters, yield and other indicators. With an irrigation amount of 180mm, the photosynthetic rate and leaf area per plant under HA treatment were significantly increased compared with CK and WT, and the increase of grain yield was not significant. In summary, spraying humic acid under low irrigation can improve the photosynthetic capacity of oat, thereby promoting grain filling and increasing grain yield.

Key words: Oat, Irrigation amount, Humic acid, Photosynthetic characteristics, Yield

Fig.1

Effects of different treatments on plant height of oat HA: Humic acid, WT: Water, CK: Control; Different lowercase letters indicate that the three different spray treatments have significant differences (P < 0.05) under the same irrigation amount, different capital letters indicate extremely significant differences (P < 0.01) under the same spray treatment with three different irrigation rates. The same below"

Fig.2

Effects of different treatments on the leaf area per plant of oat"

Fig.3

Effects of different treatments on photosynthetic indexes of oat"

Fig.4

Effects of different treatments on the relative chlorophyll content (SPAD value) of oat leaves"

Table 1

Effects of humic acid spraying with different irrigation amounts on oat yield and its components"

灌水量
Irrigation
amount		 处理
Treatment		 单位面积穗数
Number of spikes
per square meter		 小穗数
Spikelet
number		 穗长
Panicle length
(cm)		 穗粒数
Grain number
per panicle		 千粒重
1000-kernel
weight (g)		 籽粒产量
Grain yield
(kg/hm2)
60mm CK 232.0±36.7Bb 17.1±1.4Aa 20.6±2.0Ba 61.7±1.8Bb 13.7±0.3Ba 2 526.59±155.9Bb
WT 264.0±8.0Bb 18.2±2.8Aa 21.0±2.1Ba 70.3±5.4Cab 14.7±0.6Aa 2 764.66±202.2Bab
HA 344.0±13.9Aa 20.6±2.0Aa 23.5±1.5Ba 81.1±6.4Ba 14.9±2.0Aa 3 099.10±249.7Ba
120mm CK 257.3±18.0ABb 17.8±1.1Aa 22.7±0.3ABc 72.9±8.9Ab 14.6±0.7ABa 2 870.21±175.5Bb
WT 278.7±33.3ABb 19.7±1.8Aa 24.0±0.9Ab 78.3±4.4Bb 15.5±1.7Aa 3 101.85±237.1ABab
HA 354.0±16.4Aa 21.2±1.7Aa 25.4±0.5ABa 96.5±5.2Ba 16.1±1.6Aa 3 387.57±128.1ABa
180mm CK 318.7±36.1Aa 19.4±1.2Aa 24.7±0.9Aa 95.3±0.6Ab 15.5±0.7Aa 3 301.85±240.3Aa
WT 326.7±28.1Aa 20.4±1.3Aa 25.7±0.9Aa 100.7±4.5Ab 15.7±0.8Aa 3 370.21±128.3Aa
HA 357.3±11.7Aa 21.9±2.3Aa 26.7±1.8Aa 107.1±2.4Aa 16.4±1.8Aa 3 605.60±279.6Aa
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