Mineral supplementation of soybean seeds with different initial nutrient levels

ABSTRACT. The objectives of this study were to evaluate the effect of the chemical composition of soybean seeds and the efficiency of seed mineral supplementation on physiological quality and field performance. Two seed lots (high and low levels of mineral nutrition), with or without supplemental macro- and micronutrients, of three soybean cultivars (BMX Potência RR, BMX Turbo RR, and BMX Magna RR) were used. For the laboratory experiment, a completely randomized design with four replications was used. To evaluate the physiological quality of the seeds, the water content, first count, germination, 1,000-seed weight, and length and dry weight of the seedling were determined. For the field experiment, a randomized block design with four replications was used, and seedling emergence and grain yield were evaluated. Seeds with higher nutrient content produced seedlings of greater vigor and higher grain yield for all of the cultivars studied. The use of mineral supplementation in seed lots with low nutrient content resulted in greater vigor under laboratory conditions. The increase in grain yield after mineral supplementation depends on the quality of the seed lot.

摘要. 本研究旨在探究大豆种子化学成分的影响，以及种子矿物质补施措施对种子生理品质与田间表现的作用效果。实验选用3个大豆品种（BMX Potência RR、BMX Turbo RR及BMX Magna RR）的2批种子（矿物质营养水平分别为高、低），并分别设置是否添加大量及微量营养元素的处理。室内实验采用完全随机设计（completely randomized design），设置4次重复，通过测定种子含水量、发芽势（first count）、发芽率（germination）、千粒重（1,000-seed weight）以及幼苗长度与干重，评估种子生理品质。田间实验采用随机区组设计（randomized block design），设置4次重复，测定幼苗出苗率与籽粒产量。结果表明，对于所有供试品种而言，营养成分含量更高的种子可培育出活力更强的幼苗，并获得更高的籽粒产量。针对营养水平较低的种子批次施用矿物质补肥，可在室内实验条件下提升种子活力。矿物质补施后籽粒产量的提升幅度，取决于种子批次本身的品质水平。