| Characteristics of yield formation of summer maize under different irrigation modes |
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| DOI：10.7606/j.issn.1000-7601.2019.01.21 |
| Key Words: summer maize micro sprinkler irrigation pipe irrigation integration mode grain yield |
| Author Name | Affiliation | | LU Li-hua | Scientific Observation and Experimental Station of Crop Cultivation in Northern China, Ministry of Agriculture, P. R. China/Institute of Cereal and Oil Crops, Hebei Academy of Agricultural and Forestry Sciences, Shijiazhuang, Hebei 050035 | | DONG Zhi-qiang | Scientific Observation and Experimental Station of Crop Cultivation in Northern China, Ministry of Agriculture, P. R. China/Institute of Cereal and Oil Crops, Hebei Academy of Agricultural and Forestry Sciences, Shijiazhuang, Hebei 050035 | | LIANG Shuang-bo | Scientific Observation and Experimental Station of Crop Cultivation in Northern China, Ministry of Agriculture, P. R. China/Institute of Cereal and Oil Crops, Hebei Academy of Agricultural and Forestry Sciences, Shijiazhuang, Hebei 050035 | | ZHANG Jing-ting | Scientific Observation and Experimental Station of Crop Cultivation in Northern China, Ministry of Agriculture, P. R. China/Institute of Cereal and Oil Crops, Hebei Academy of Agricultural and Forestry Sciences, Shijiazhuang, Hebei 050035 | | ZHANG Li-hua | Scientific Observation and Experimental Station of Crop Cultivation in Northern China, Ministry of Agriculture, P. R. China/Institute of Cereal and Oil Crops, Hebei Academy of Agricultural and Forestry Sciences, Shijiazhuang, Hebei 050035 | | JIA Xiu-ling | Scientific Observation and Experimental Station of Crop Cultivation in Northern China, Ministry of Agriculture, P. R. China/Institute of Cereal and Oil Crops, Hebei Academy of Agricultural and Forestry Sciences, Shijiazhuang, Hebei 050035 |
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| Abstract: |
| The objective of this study was to explore the optimization of the integration mode of irrigation under limited water condition, the high yield potential, and physiological characteristics of high yield for summer maize. A field experiment was carried out with re-split plot design (main plot of irrigation mode, split plot of density and re-split plot of harvest time) in Gaocheng of Hebei province from 2015 to 2016 to study the effects of two types of integrated irrigation modes on the grain yield formation of summer maize for Zhengdan 958 under two density conditions. The two irrigation methods were micro sprinkler irrigation (micro-irrigation) and pipe irrigation, with two planting densities of 6.3×104 and 7.8×104 plants·ha-1, and two harvest dates on Sep. 25 and Oct. 3. The results showed that soil moisture content in the top layer (0~60 cm) for micro-irrigation mode was 5.9%~20.2% higher due to 3X integration fertilization and irrigation. So, compared with pipe-irrigation, micro-irrigation mode increased maize plant growth due to sufficient shallow soil water conditions, and the LAI of jointing stage was 30.2%~44.2% higher, SPAD of late growth stage slowly decreased to just 4.9%~5.9% higher, and CGR was 9.0%~26.3% higher than that of pipe irrigation. So, the 1000-grain weight and yield of maize were increased, especially for micro-irrigation mode when harvest time was delayed, the increasing yield effect was more obvious with 5.1%~6.0% and 7.2%~10.8% increase in yield for early and late harvests than that of pipe irrigation, respectively. Basal stem lodging index, leaf SPAD values, and CGR of micro irrigation mode in high density condition were better than or equivalent to those indexes of pipe irrigation in low density, 4.0%~27.3%, -1.0%~3.7%, and 24.3%~37.7%, respectively. It showed that the micro-irrigation mode is better than the pipe-irrigation mode, and when planting density with micro-irrigation mode was increased, these indicators would not be worse. The potential increase of maize yield could be exploited when comprehensive application of the three technologies (micro irrigation + high density + delaying harvest time) that resulted in 23.3% increase in yield. This study provided a technical support for water-saving and high-yield cultivation of maize. |
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