Irin Israt Jahan, Hasanuzzaman Mirza
Department of Agronomy, Khulna Agricultural University, Khulna, 9100, Bangladesh.
Department of Agronomy, Faculty of Agriculture, Sher-e-Bangla Agricultural University, Dhaka 1207, Bangladesh.
Heliyon. 2024 Sep 19;10(19):e38159. doi: 10.1016/j.heliyon.2024.e38159. eCollection 2024 Oct 15.
Salinity negatively impacts soil fertility by impairing the development and physiological functions of foxtail millet plants. Organic amendments have emerged as a viable solution in the reclamation and management of salinity inflicted soils and improve the performance of crop. In this regard, a pot experiment was carried out to examine the effect of organic amendments (OAs) on soil quality and its influence on the growth and physiology of foxtail millet under saline and non-saline condition. The findings indicated that under salt stress conditions, the levels of proline, hydrogen peroxide (HO), and electrolyte leakage (EL) risen, whilst other physiological parameters decrease in foxtail millet. However, the addition of OAs, particularly dhaincha and biochar (BC), has shown a promising salt tolerant amendment among others. Its addition improved the growth performance of salinity-stressed plants, including plant height, fresh and dry biomass, simultaneously decreased sodium ion (Na) and improved calcium (Ca), potassium (K), and nitrate ion (NO ). They also increased proline build up by 6-17 %, reduced HO (19-38 %) and malondialdehyde (16-18 %). Furthermore, they elevated the relative water content (RWC) (25 %), chlorophyll content, and reduced EL (29-50 %). Once more, dhaincha and BC enhanced the number of rhizobia, phosphorus-solubilizing bacteria (PSB) and overall bacterial population in the soil. In saline soil, daincha and BC could enhance soil organic matter (628 %), total nitrogen (1630 %), available phosphorus (32-38 %), and exchangeable potassium (54-73 %). A potential strategy for improving performance under salt is suggested to be the following order, dhaincha > biochar > vermicompost > duckweed. The study would assist stakeholders in these salinity-prone areas in strategizing the use of OAs to their fallow land for cultivation and agricultural activities.
盐分通过损害谷子植株的发育和生理功能对土壤肥力产生负面影响。有机改良剂已成为盐碱化土壤改良和管理的可行解决方案，并能提高作物性能。在此方面，开展了一项盆栽试验，以研究有机改良剂（OAs）对土壤质量的影响及其在盐渍和非盐渍条件下对谷子生长和生理的影响。研究结果表明，在盐胁迫条件下，谷子体内脯氨酸、过氧化氢（HO）和电解质渗漏（EL）水平升高，而其他生理参数下降。然而，添加OAs，特别是田菁和生物炭（BC），在其他改良剂中显示出有前景的耐盐性。其添加改善了盐胁迫植株的生长性能，包括株高、鲜重和干重，同时降低了钠离子（Na）含量，提高了钙（Ca）、钾（K）和硝酸根离子（NO）含量。它们还使脯氨酸积累增加了6 - 17%，降低了HO（19 - 38%）和丙二醛（16 - 18%）。此外，它们提高了相对含水量（RWC）（25%）、叶绿素含量，并降低了EL（29 - 50%）。再者，田菁和BC增加了土壤中根瘤菌、解磷细菌（PSB）的数量以及总体细菌数量。在盐渍土壤中，田菁和BC可提高土壤有机质（628%）、全氮（1630%）、有效磷（32 - 38%）和交换性钾（54 - 73%）。提出一种改善盐胁迫下性能的潜在策略，顺序如下：田菁 > 生物炭 > 蚯蚓堆肥 > 浮萍。该研究将帮助这些易受盐害地区的利益相关者制定策略，将OAs用于其休耕地进行种植和农业活动。
