Bouquet ears in maize inbred lines as affected by agronomic factors

IF 1 Q3 AGRONOMY

Journal of Crop Improvement Pub Date : 2022-04-25 DOI:10.1080/15427528.2022.2063776

A. Mahrokh, Hadi Hassanzadeh Moghadam, H. Najafinezhad, A. Shirkhani, B. Ahmadi, F. Azizi, F. Golzardi

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引用次数: 3

Abstract

ABSTRACT “Bouquet ears” is known to reduce grain yield in maize (Zea mays L.). The impact of agronomic factors on the bouquet occurrence rate (BOR) needs to be investigated. Two separate trials were conducted to assess the effects of nitrogen fertilizer, planting density, herbicide application, and planting date on the BOR in maize inbred lines (Mo17, K615/1, and KE72012/12) across two locations and 2 years (2018 and 2019). In Trial 1, the effects of nitrogen rate (200, 450, and 700 kg ha−1) and planting density (55,000, 70,000, and 85,000 plants ha−1) and in Trial 2, the effects of herbicide application (no-2,4-D application and 2,4-D at V5 and V7 stages) and planting date (May 25, June 4, and June 14) were evaluated. Planting density had no significant impact on the BOR in the inbred lines Mo17 and KE72012/12. In the inbred line K615/1, the BOR was inversely affected by planting density; BOR was 14% at 55,000 plants ha−1, 10% at 70,000 plants ha−1, and 8% at 85,000 plants ha−1. Delaying the planting date (PD) from May 25 till June 4 did not affect BOR; however, delaying PD to June 14 drastically increased BOR; KE72012/12 showed 3.56% BOR for June 14 PD, which was 215% higher than that for June 4 PD. Overall, the BOR could be significantly decreased in maize, provided proper genotypes are planted at suitable times (May 25 to June 4) at densities higher than 55,000 plants ha−1.

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农艺因素对玉米自交系花穗的影响

摘要：众所周知，“花穗”会降低玉米的产量。农艺因素对花穗发生率的影响有待研究。进行了两项单独的试验，以评估氮肥、种植密度、除草剂施用和种植日期对玉米自交系（Mo17、K615/1和KE72012/12）在两个地点和两年（2018年和2019年）BOR的影响。在试验1中，评估了施氮量（200、450和700 kg公顷-1）和种植密度（55000、70000和85000株公顷-1）的影响，在试验2中，评估了除草剂施用（在V5和V7阶段施用2，4-D和2，4-D）和种植日期（5月25日、6月4日和6月14日）的影响。种植密度对自交系Mo17和KE72012/12的BOR没有显著影响。在自交系K615/1中，BOR与种植密度呈负相关；BOR在55000株ha−1时为14%，在70000株ha−2时为10%，在85000株ha−3时为8%。将种植日期（PD）从5月25日推迟到6月4日并没有影响BOR；然而，将PD推迟到6月14日大大增加了BOR；KE72012/12显示，6月14日PD的BOR为3.56%，比6月4日PD高215%。总体而言，玉米的BOR可以显著降低，前提是在适当的时间（5月25日至6月4号）以高于55000株ha−1的密度种植适当的基因型。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Crop Improvement Multiple-

CiteScore

3.30

自引率

7.70%

发文量

期刊介绍： Journal of Crop Science and Biotechnology (JCSB) is a peer-reviewed international journal published four times a year. JCSB publishes novel and advanced original research articles on topics related to the production science of field crops and resource plants, including cropping systems, sustainable agriculture, environmental change, post-harvest management, biodiversity, crop improvement, and recent advances in physiology and molecular biology. Also covered are related subjects in a wide range of sciences such as the ecological and physiological aspects of crop production and genetic, breeding, and biotechnological approaches for crop improvement.