ABSTRACT

Drought is a detrimental abiotic stress limiting wheat growth and yield. Harmful impacts of drought stress can be ameliorated by the use of different growth enhancers either applied as soil amendment or by the foliar spray. The Present research was conducted under semi-arid conditions at Research area of Agronomy Department, The Islamia University of Bahawalpur, Bahawalpur, Pakistan. Investigations were made to have an insight into the role of three different amendments to minimize drought stress impacts in wheat during two consecutive years 2017–2018 and 2018–2019. Four drought treatments (control, drought at tillering, drought at flowering and drought at grain filling) and four drought amendments (control, PGPR, silicon and biochar) were used in an experiment with RCBD split plot arrangement. In order to impose drought stress, irrigation was stopped at different growth stages as per treatment. PGPR were applied by seed treatment technique, biochar was applied during soil preparation and silicon was applied foliarly. Drought stress markedly decreased the wheat growth and yield with maximum reduction in plots where crop faced drought at grain filling stage. All amendments had positive results in controlling drought stress but PGPR performed the best by improving leaf water relations, maximizing chlorophyll contents, grain yield, nutrients’ uptake and quality of drought-stressed wheat than other treatments.

摘要

干旱是有害的非生物胁迫，限制了小麦的生长和产量。干旱胁迫的有害影响可以通过使用不同的土壤改良剂或叶面喷施生长促进剂来减轻。本研究是在巴基斯坦巴哈瓦尔布尔伊斯兰大学巴哈瓦尔布尔农学系研究区在半干旱条件下进行的。进行了调查，以了解三种不同修正案的作用，以在2017-2018年和2018-2019年连续两年内最大程度地减少干旱对小麦的胁迫影响。在RCBD分割地块布置的试验中，使用了四种干旱处理（对照，分ing干旱，开花干旱和籽粒灌浆干旱）和四种干旱改良剂（对照，PGPR，硅和生物炭）。为了施加干旱压力，根据处理，在不同的生长阶段停止灌溉。通过种子处理技术施用PGPR，在整地过程中施用生物炭，然后叶面施用硅。干旱胁迫显着降低了小麦的生长和产量，在谷物灌浆期作物面临干旱的地块上减幅最大。所有修正案在控制干旱胁迫方面均取得了积极成果，但与其他处理相比，PGPR在改善叶片水分关系，最大程度提高干旱胁迫小麦的叶绿素含量，谷物产量，养分吸收和品质方面表现最佳。干旱胁迫显着降低了小麦的生长和产量，在谷物灌浆期作物面临干旱的地块上减幅最大。所有修正案在控制干旱胁迫方面均取得了积极成果，但与其他处理相比，PGPR在改善叶片水分关系，最大程度提高干旱胁迫小麦的叶绿素含量，谷物产量，养分吸收和品质方面表现最佳。干旱胁迫显着降低了小麦的生长和产量，在谷物灌浆期作物面临干旱的地块上减幅最大。所有修正案在控制干旱胁迫方面均取得了积极成果，但与其他处理相比，PGPR在改善叶片水分关系，最大程度提高干旱胁迫小麦的叶绿素含量，谷物产量，养分吸收和品质方面表现最佳。