浙江农业学报 ›› 2021, Vol. 33 ›› Issue (1): 8-17.DOI: 10.3969/j.issn.1004-1524.2021.01.02

• 作物科学 • 上一篇    下一篇

滴灌条件下不同耕深及秸秆还田量对玉米生长的影响

刘根红(), 薛银鑫, 张倩, 周佳瑞, 买小凤   

  1. 宁夏大学 农学院,宁夏 银川 750021
  • 收稿日期:2020-06-19 出版日期:2021-01-25 发布日期:2021-01-25
  • 作者简介:刘根红(1973—),男,宁夏隆德人,博士,教授,主要从事作物栽培与耕作学研究。E-mail:liu_genhong@163.com
  • 基金资助:
    宁夏回族自治区自然科学基金(2018AAC03001)

Effects of different tillage depth and amount of straw returned to the field on maize growth under drip-irrigation

LIU Genhong(), XUE Yinxin, ZHANG Qian, ZHOU Jiarui, MAI Xiaofeng   

  1. College of Agriculture, Ningxia University, Yinchuan 750021, China
  • Received:2020-06-19 Online:2021-01-25 Published:2021-01-25

摘要:

滴灌已逐渐成为宁夏引黄灌区玉米新型灌溉方式,以玉米天赐19号为试材,采用裂区设计,主区为耕深,设0.25~0.30 m、0.30~0.35 m、0.35~0.40 m三水平,秸秆还田量为副区,设常规栽培秸秆1/4还田量、1/3还田量、1/2还田量三水平,以明确玉米滴灌条件下适宜的耕深与秸秆还田量水平。结果表明,各处理对玉米生长指标及产量的影响有差异,以耕深0.30~0.35 m、秸秆1/3还田量水平组合条件下与其他处理间差异明显,产量间差异极显著(P<0.01)。该处理条件下,玉米生长苗期0~0.2 m土壤温度升高明显,最大差异为1.5 ℃,增加了8.6%;其吐丝灌浆期净光合速率(PSA)比最低处理高34.5%,百粒重比最低处理高6%,其花后20 d灌浆速率(GFA)比最低处理高26.9%,产量14 781.9 kg·hm-2,比最低处理高16.3%。但不同处理对株高、叶面积指数(LAI)、穗粗的影响不同,以秸秆1/2还田量、耕深0.25~0.30 m组合对苗期株高、拔节期LAI及穗粗性状影响显著。因此,玉米滴灌以耕深0.30~0.35 m、秸秆1/3还田量组合时,主要田间生长性状良好,穗部性状穗长、穗粗、百粒重均优于其他处理,产量最高,适宜于灌区推广。

关键词: 玉米, 耕深, 秸秆还田, 耕作方式

Abstract:

Drip irrigation has gradually become a new resource-saving cultivation method in the irrigation area of Ningxia; however, the depth of tillage and the amount of straw returned to the field under drip irrigation were not clear. The experiment was conducted to study suitable tillage depth and the level of returning straw to field under drip irrigation. Tianci No. 19 was the test maize material, and the split-plot experiment design was adopted. The main plot was tillage depth with three levels of 0.25-0.30 m, 0.30-0.35 m, 0.35~0.40 m, and the amount of straw returned to field was quarter, one third and one half of the straw amount returned to field in conventional cultivation. The results showed that the effects of different treatments on the growth index and yield of maize were different, and the difference between the treatments was significant (P<0.01) at the level of 0.30~0.35 m of tillage depth and one third of the straw amount returned to field. In this treatment, the soil temperature of 0-0.2 m at seedling stage increased obviously, the maximum difference was 1.5 ℃, the increase rate was 8.6%, the photosynthetic rate (PSA) at silking-filling stage was 34.5% higher than the lowest treatment, the 100-grain weight was 6% higher than the lowest treatment, the filling rate (GFA) at 20 days after pollination was 26.9% higher than the lowest treatment, the yield was 14 781.9 kg·hm-2, and the yield was 16.3% higher than the lowest treatment. But different treatments had different effects on plant height, leaf area index (LAI) and ear diameter. The treatment one half amount of straw returned to field and 0.25-0.30 m of tillage depth had significant effects on plant height, LAI at jointing stage and ear diameter. It was concluded that the main field growth characters were good at the level of 0.30-0.35 m tillage depth and one third of the straw amount returned to the field. The ear length, ear diameter and 100-grain weight of ear characters were all better than other treatments, and the yield was the highest, which was suitable for promotion in irrigation area.

Key words: maize, tillage depth, straw amount return to field, farming methods

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