干旱胁迫和缺钾对大豆活力和叶温的交互作用

IF 1.3 Q3 AGRONOMY Agrosystems, Geosciences & Environment Pub Date : 2024-10-18 DOI:10.1002/agg2.20576
C. C. Ortel, T. L. Roberts, L. C. Purcell, W. J. Ross, K. A. Hoegenauer, C. A. Followell, M. Victorio Pessotto
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引用次数: 0

摘要

钾(K)营养和干旱胁迫通过对水分调节的综合影响来影响大豆(Glycine max (L.) Merr.)的活力和产量。我们对在避雨棚下 18.9 升水桶中种植的大豆进行了一项研究,以确定这些作物胁迫在不同生长阶段的相互作用如何影响作物叶片钾浓度、生物量产量、钾总吸收量(TKU)、谷物产量和最上部完全展开的三叶叶片的温度。在两种不同的淤泥质壤土上种植的大豆,在播种前施用或不施用钾肥,土壤湿度为田间容重的 50%(干旱)或 80%(水分充足),在无性生长期(V3-V7)、开花期(R1-R3)、豆荚发育期(R4-R6 初期)和种子发育期(R5-R6 中期)施加干旱。研究期间,在所有处理中都观察到了广泛的钾缺乏现象。干旱胁迫明显(p < 0.05)降低了TKU、地上生物量产量和谷物产量。施加干旱胁迫时的作物生长阶段是一个重要因素,在生殖生长期间施加胁迫时,植物反应参数的降低幅度更大。在干旱条件下,播种前施钾肥可增加三叶酚酸钾浓度和三叶酚酸钾单位(TKU),但并不能提高水分充足的大豆的谷物产量。与水分充足的大豆相比,干旱胁迫下的大豆叶温升高(p < 0.0001),但由于普遍缺钾,作物钾营养状况对叶温的影响尚无定论。结果强调了大豆钾营养与干旱胁迫之间相互作用的复杂性,因为干旱胁迫阻碍了钾的吸收,加剧了钾的缺乏,并限制了产量。
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Interaction of drought stress and potassium deficiency on soybean vigor and leaf temperature

Potassium (K) nutrition and drought stress affect soybean (Glycine max (L.) Merr.) vigor and productivity through the combined impacts on water regulation. A study was conducted with soybean grown in 18.9-L buckets under a rain out shelter to determine how the interaction between these crop stresses at various growth stages influences the crop leaf K concentration, biomass production, total K uptake (TKU), grain yield, and temperature of the uppermost fully expanded trifoliate. Treatments included soybean grown with and without preplant fertilizer K, soil moisture at 50% (drought) or 80% (well-watered) field capacity, imposed drought during vegetative growth (V3–V7), flowering (R1–R3), pod development (R4–early R6), and seed development (R5–mid-R6) on two different silt loam soils. Widespread K deficiencies were observed during the study across all treatments. Drought stress significantly (p < 0.05) reduced the TKU, aboveground biomass production, and grain yield. The crop growth stage when drought stress was imposed was a significant factor, with greater reductions in plant response parameters when stress was imposed during reproductive growth. Preplant fertilizer K increased trifoliolate K concentrations and TKU in drought conditions, but did not increase the grain yield of well-watered soybean. Leaf temperature increased when under drought stress compared to well-watered soybean (p < 0.0001) but the impact of crop K nutrition status on leaf temperature was inconclusive because of widespread K deficiencies. Results emphasize the complexity of the interactions between K nutrition and drought stress in soybean, as drought stress impeded K uptake, exacerbated K deficiencies, and limited yield.

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来源期刊
Agrosystems, Geosciences & Environment
Agrosystems, Geosciences & Environment Agricultural and Biological Sciences-Agricultural and Biological Sciences (miscellaneous)
CiteScore
2.60
自引率
0.00%
发文量
80
审稿时长
24 weeks
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