Irrigation management practices with novel plant growth regulators improve root growth, root lodging resistance and maize productivity under semi-arid regions

IF 6.4 1区 农林科学 Q1 AGRONOMY
Haixing Zhang , Shahzad Ali , Yan Chen , Liyu Yang , Gang Pang , Mohamed E. Assal , Mohammed Rafi Shaik
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引用次数: 0

Abstract

Climate change has increased the frequency of drought; water resource management strategies must be adopted to reduce water pressure and increase corn yield, enabling growers to implement sustainable water-saving technologies. Improving the spatiotemporal coordination between soil moisture, root growth, and root lodging resistance is crucial for maize growth. Therefore, we conducted field trials during 2022 and 2023 under three irrigation practices D: drip irrigation; F: flood irrigation; R: rainfed with two novel growth regulators G1: ethephon and cycocel (EC); G2: diethyl aminoethyl hexanoate (DA-6); and G3: EC+DA-6 combined applications. DG3 treatment, soil moisture, root biomass, and nutrient concentrations could be significantly improved, thus promoting root distribution, and nutrients absorption. DG3 treatment significantly improved the rooting system of the 60 cm upper soil profile. DG3 treatment significantly improved the root and stem exudates during the jointing and flowering stages. In the top of 0–60 cm, the root length density (RLD) and root surface area density (RSAD) of DG3 treatment were significantly higher during flowering and maturation stages. In addition, there was no significant change in RLD and RSAD in soil below 60 cm. Total lodging rate, root dry weight density, and root diameter occurred earlier under DG3 treatment, while TLR and RD under FG3 treatment were delayed. The average growth rate (Ć), maximum growth rage (cm) and maximum values (Wmax) of TRDW TRL, and ARD were significantly higher. DG3 treatment promoted the releases of several mineral components. In addition, DG3 treatment, it performed well in leaf water potential (Ψl), and root water potential (Ψr), there is a greater gradient between Ψl, and Ψr and lower crop water stress index. DG3 treatment increased RLD, RSAD, RVD, RWD, and root diameter, which contributed to root development and increased IWUE (55.7 %), irrigation water productivity (71.3 %), as a results significantly increasing (26.9 %) maize yield. In summary, DG3 treatment has great potential to improve maize yield by enhancing the spatial coordination between root distribution, and soil moisture movement.
采用新型植物生长调节剂的灌溉管理措施可改善半干旱区玉米根系生长、抗倒伏能力和产量
气候变化增加了干旱发生的频率;必须采取水资源管理战略,减少水资源压力,提高玉米产量,使种植者能够实施可持续的节水技术。改善土壤水分、根系生长和根系抗倒伏之间的时空协调性对玉米生长至关重要。因此,我们在2022年和2023年进行了三种灌溉方式的田间试验D:滴灌;F:漫灌;R:雨饲两种新型生长调节剂G1:乙烯利和环己烷(EC);G2:己酸二乙基氨基乙酯(DA-6);G3: EC+DA-6组合应用。DG3处理显著改善了土壤水分、根系生物量和养分浓度,促进了根系分布和养分吸收。DG3处理显著改善了60 cm表层土壤根系。DG3处理显著提高了拔节期和开花期的根、茎分泌物。在0 ~ 60 cm顶部,DG3处理的根长密度(RLD)和根表面积密度(RSAD)在开花期和成熟期均显著较高。60 cm以下土壤RLD和RSAD变化不显著。DG3处理的总倒伏率、根干重密度和根径发生较早,而FG3处理的TLR和RD发生较晚。TRDW、TRL和ARD的平均生长率(Ć)、最大生长范围(cm)和最大值(Wmax)显著高于TRDW、TRL和ARD。DG3处理促进了几种矿物成分的释放。此外,DG3处理在叶片水势(Ψl)和根系水势(Ψr)方面表现较好,Ψl和Ψr之间有较大的梯度,作物水分胁迫指数较低。DG3处理提高了RLD、RSAD、RVD、RWD和根径,促进了根系发育,提高了IWUE(55.7% %)和灌溉水生产力(71.3 %),显著提高了玉米产量(26.9% %)。综上所述,DG3处理通过加强根系分布与土壤水分运动的空间协调,具有提高玉米产量的巨大潜力。
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来源期刊
Field Crops Research
Field Crops Research 农林科学-农艺学
CiteScore
9.60
自引率
12.10%
发文量
307
审稿时长
46 days
期刊介绍: Field Crops Research is an international journal publishing scientific articles on: √ experimental and modelling research at field, farm and landscape levels on temperate and tropical crops and cropping systems, with a focus on crop ecology and physiology, agronomy, and plant genetics and breeding.
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