LEAF GAS EXCHANGE AND FLOWERING OF MANGO SPRAYED WITH BIOSTIMULANT IN SEMI-ARID REGION

ABSTRACT The aim of the present study was to evaluate the effect of biostimulant containing amino acids and yeast extract on the physiological and reproductive characteristics of mango cv. Tommy Atkins during the shoot maturation phase in tropical semi-arid region. The experimental design consisted of randomized blocks with five treatments, five replications and five plants per plot. Treatments consisted of: T1) two foliar sprays with [biostimulant + KCl] + two foliar sprays with K2SO4; T2) No biostimulant and four foliar sprays with K2SO4; T3) three individual foliar sprays with biostimulant and one foliar spray with K2SO4; T4) two foliar sprays with biostimulant and two foliar sprays with K2SO4; and T5) two foliar sprays with [biostimulant + K2SO4] + one foliar spray with K2SO4. There is a positive effect of the biostimulant containing amino acids and yeast extract on transpiration, internal CO2 concentration, water-use efficiency and number of reproductive and non-differentiated shoots of mango cv. Tommy Atkins cultivated under tropical semi-arid condition, with attenuating effect on plant abiotic stress. For shoot maturation of mango cv. Tommy Atkins, three foliar sprays with biostimulant containing amino acids and yeast extract (10 mL per plant) and one with K2SO4 (3%), starting at 45 days after paclobutrazol application (T3), can be recommended.摘要 本研究旨在评估热带半干旱地区新梢成熟期内，含氨基酸与酵母提取物的生物刺激素（biostimulant）对汤米·阿特金斯（Tommy Atkins）芒果品种生理特性与生殖特性的影响。实验采用随机区组设计，设置5个处理、5次重复，每小区种植5株植株。各处理方案如下：T1：两次叶面喷施[生物刺激素（biostimulant）+氯化钾（KCl）] + 两次叶面喷施硫酸钾（K2SO4）；T2：不施用生物刺激素，仅进行四次叶面喷施硫酸钾（K2SO4）；T3：三次单独叶面喷施生物刺激素（biostimulant），一次叶面喷施硫酸钾（K2SO4）；T4：两次叶面喷施生物刺激素（biostimulant）+两次叶面喷施硫酸钾（K2SO4）；T5：两次叶面喷施[生物刺激素（biostimulant）+硫酸钾（K2SO4）] + 一次叶面喷施硫酸钾（K2SO4）。 研究结果显示，在热带半干旱栽培条件下，含氨基酸与酵母提取物的生物刺激素可对汤米·阿特金斯芒果的蒸腾作用、胞内二氧化碳浓度、水分利用效率以及生殖梢与未分化梢数量产生积极影响，同时可缓解植株所受的非生物胁迫。针对汤米·阿特金斯芒果的新梢成熟期培育，推荐采用处理T3方案：于多效唑（paclobutrazol）施用后45天开始，对每株植株喷施含氨基酸与酵母提取物的生物刺激素（10毫升/株）共3次，同时喷施3%浓度的硫酸钾（K2SO4）1次。