PHYSIOLOGICAL MATURATION IN SEEDS OF SWEET SOGHUM FOR FOLIAR FERTILISATION WITH SILICATE

ABSTRACT The aim of this study was to evaluate physiological quality in seeds of sweet sorghum grown under semi-arid conditions, and to determine the age of physiological maturity of the seeds as a function of the foliar application of potassium silicate. The experiment was carried out at the Curu Valley Experimental Farm, in Pentecoste in the state of Ceará, during the rainy seasons of 2014 and 2015. The BRS 506 and BRS 511 varieties were used, under foliar fertilisation with potassium silicate at doses of 500, 1000 and 1500 mL.ha -1, in addition to the control lots (with no application); harvesting was at four periods, 30, 37, 44 and 51 days after full bloom (DAB). The percentage and speed of germination were evaluated, together with the accelerated ageing test and seedling growth. The seeds presented greater than 90% germination from 37 DAB, reaching high seedling vigour at 51 DAB. Foliar fertilisation with potassium silicate under the conditions of the experiment resulted in an increase in the physiological quality of the seeds. The BRS 506 and BRS 511 cultivars displayed the highest physiological quality between 49 and 53 DAF.

摘要 本研究旨在评估半干旱种植条件下甜高粱种子的生理品质，并明确叶面喷施硅酸钾处理下种子的生理成熟年龄。实验于2014年与2015年雨季期间，在巴西塞阿拉州彭特科斯特的库鲁谷实验农场开展。试验选用BRS 506与BRS 511两个品种，叶面施加硅酸钾肥料，施用量分别为500、1000及1500 mL·ha⁻¹，另设不进行喷施的对照组；分别于盛花后30、37、44及51天（days after full bloom，以下简称DAB）四个时期开展收获。本研究测定了种子发芽率与发芽速率，同时开展加速老化试验与幼苗生长性状评估。结果显示，盛花后37天收获的种子发芽率可达90%以上，至51天时幼苗活力达到较高水平。本试验条件下，叶面喷施硅酸钾肥可提升种子生理品质。BRS 506与BRS 511两个品种的种子生理品质峰值出现在盛花后49至53天（DAF）。