Weed interference periods in lettuce crop

IF 0.7 4区 农林科学 Q4 HORTICULTURE
N. Riva, D. F. Biffe, Daniel Nalin, R. Mendes, L. A. Ferreira, V. Silva, J. Constantin
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Abstract

ABSTRACT The knowledge of the adequate period for the beginning of weed management in lettuce crop can increase the efficiency of production, reducing the costs with management. The aim of this study was to determine the pre-interference period (PIP), the critical time for weed removal (CTWR) and the critical period of weed control (CPWC) in three lettuce cultivars, Elisa, Lucy Brown and Solaris. Coexistence and the absence of weeds were evaluated for each cultivar. The design was in randomized blocks with seven treatments (0, 7, 14, 21, 28, 35 and 42 days after transplanting - DAT) of coexistence and the same seven periods of weed absence with four replicates in each experiment. The highest infestation densities were with the species Oxalis latifolia, Coronopus didymus and Amaranthus hybridus. The leaf area and number of leaves per plant were reduced by up to 50% and 66%, respectively, in relation to the longest period of coexistence with weeds and yield reduced by 48% (Elisa), 40% (Lucy Brown) and 33% (Solaris). The cultivar Solaris showed greater tolerance to weed interference. Based on yield, PIP was 1, 3 and 3 DAT and CTWR was 37, 37 and 35 DAT, and CPWC was 2 to 37, 3 to 37 and 3 to 35 for the cultivars Elisa, Lucy Brown and Solaris, respectively.
生菜作物杂草干扰期
摘要了解生菜作物除草的适宜起始期,可以提高生产效率,降低管理成本。以Elisa、Lucy Brown和Solaris 3个生菜品种为研究对象,确定了干预前时间(PIP)、除草关键时间(CTWR)和除草关键时间(CPWC)。对每个品种的共存率和无杂草率进行了评价。采用随机区组设计,分别在移栽后0、7、14、21、28、35和42 d进行共存处理和7期无杂草处理,每个试验设4个重复。侵染密度最高的是草叶草(Oxalis latifolia)、冠蚜(Coronopus didymus)和杂交苋(Amaranthus hybridus)。与杂草共存时间最长时相比,单株叶面积和单株叶数分别减少了50%和66%,产量分别减少了48% (Elisa)、40% (Lucy Brown)和33% (Solaris)。品种Solaris对杂草干扰的耐受性较好。按产量计算,Elisa、Lucy Brown和Solaris品种的PIP分别为1、3和3 DAT, CTWR分别为37、37和35 DAT, CPWC分别为2 ~ 37、3 ~ 37和3 ~ 35 DAT。
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来源期刊
Horticultura Brasileira
Horticultura Brasileira 农林科学-园艺
CiteScore
1.40
自引率
28.60%
发文量
45
审稿时长
4-8 weeks
期刊介绍: The journal Horticultura Brasileira, a quarterly journal, is the Official Publication of the Sociedade de Olericultura do Brasil. Its abbreviated title is Hortic. bras., and it should be used in bibliographies, footnotes, references and bibliographic strips.
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