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Dynamic critical potassium concentrations in soybean leaves and petioles for monitoring potassium nutrition
Agronomy Journal ( IF 2.1 ) Pub Date : 2021-07-22 , DOI: 10.1002/agj2.20819 Nathan A. Slaton 1 , Gerson Laerson Drescher 1 , Md Rasel Parvej 2 , Trenton L. Roberts 1
Agronomy Journal ( IF 2.1 ) Pub Date : 2021-07-22 , DOI: 10.1002/agj2.20819 Nathan A. Slaton 1 , Gerson Laerson Drescher 1 , Md Rasel Parvej 2 , Trenton L. Roberts 1
Affiliation
Soybean [Glycine max (L.) Merr.] critical tissue-K concentrations associated with the bloom to early pod set growth stages have been used to diagnose K deficiency for decades. The ability to interpret tissue concentrations beyond the R2 stage would strengthen soybean tissue monitoring programs. Our objective was to develop continuous critical-K concentrations for the trifoliolate leaf and petiole of irrigated soybean. Trifoliolate leaf- and petiole-K concentration data were collected during soybean reproductive growth from 10 research trials. Multiple regression was performed to predict relative soybean yield as a function of tissue-K concentrations and days after R1 development (DAR1). The 10 research trials provided >1,400 leaf- and petiole-K concentration observations from the R1–R6 stages of soybean cultivars from the 4.4–5.5 relative maturity groups. Among the 10 trials, soybean receiving no fertilizer-K produced 59.2–83.2% of the maximum yield produced by soybean receiving fertilizer-K. The sufficient leaf-K concentrations associated with 95% relative yield were 20.2 g K kg–1 at 1 DAR1, 18.5 g K kg–1 at 20 DAR1, 15.5 g K kg–1 at 40 DAR1, and 11.2 g K kg–1 at 60 DAR1, which occur at the R1, R2, and R3-R4, and R5-R6 growth stages, respectively. Compared with leaf-K concentration, the sufficient petiole-K concentrations associated with 95% relative yield were 2.5 times greater at R1 but similar at 70 DAR1 (R6). Agricultural analytical laboratories can use these sufficiency equations for soybean leaf- or petiole-K concentrations, with planting date and maturity group information, to interpret soybean K sufficiency.
中文翻译:
用于监测钾营养的大豆叶片和叶柄中动态临界钾浓度
大豆 [ Glycine max(L.) Merr.] 几十年来,与开花到早期结荚生长阶段相关的关键组织 K 浓度已被用于诊断 K 缺乏症。在 R2 阶段之后解释组织浓度的能力将加强大豆组织监测计划。我们的目标是为灌溉大豆的三叶草叶和叶柄开发连续的临界钾浓度。从 10 项研究试验中收集了大豆生殖生长过程中三叶酸钾和叶柄钾的浓度数据。进行多元回归以预测相对大豆产量作为组织钾浓度和 R1 发育后天数 (DAR1) 的函数。10 项研究试验提供了来自 4.4-5.5 相对成熟度组的大豆品种 R1-R6 阶段的超过 1,400 个叶和叶柄 K 浓度观察值。在 10 次试验中,未施钾的大豆产量为施钾大豆的最大产量的 59.2-83.2%。与 95% 相对产量相关的足够叶钾浓度为 20.2 g K kg–1在 1 DAR1、18.5 g K kg –1在 20 DAR1、15.5 g K kg –1在 40 DAR1 和 11.2 g K kg –1在 60 DAR1,发生在 R1、R2 和 R3-R4,和 R5-R6 生长阶段,分别。与叶钾浓度相比,与 95% 相对产量相关的足够叶柄钾浓度在 R1 时高出 2.5 倍,但在 70 DAR1 (R6) 时相似。农业分析实验室可以使用这些大豆叶或叶柄钾浓度的充足方程,以及种植日期和成熟组信息,来解释大豆钾的充足率。
更新日期:2021-07-22
中文翻译:
用于监测钾营养的大豆叶片和叶柄中动态临界钾浓度
大豆 [ Glycine max(L.) Merr.] 几十年来,与开花到早期结荚生长阶段相关的关键组织 K 浓度已被用于诊断 K 缺乏症。在 R2 阶段之后解释组织浓度的能力将加强大豆组织监测计划。我们的目标是为灌溉大豆的三叶草叶和叶柄开发连续的临界钾浓度。从 10 项研究试验中收集了大豆生殖生长过程中三叶酸钾和叶柄钾的浓度数据。进行多元回归以预测相对大豆产量作为组织钾浓度和 R1 发育后天数 (DAR1) 的函数。10 项研究试验提供了来自 4.4-5.5 相对成熟度组的大豆品种 R1-R6 阶段的超过 1,400 个叶和叶柄 K 浓度观察值。在 10 次试验中,未施钾的大豆产量为施钾大豆的最大产量的 59.2-83.2%。与 95% 相对产量相关的足够叶钾浓度为 20.2 g K kg–1在 1 DAR1、18.5 g K kg –1在 20 DAR1、15.5 g K kg –1在 40 DAR1 和 11.2 g K kg –1在 60 DAR1,发生在 R1、R2 和 R3-R4,和 R5-R6 生长阶段,分别。与叶钾浓度相比,与 95% 相对产量相关的足够叶柄钾浓度在 R1 时高出 2.5 倍,但在 70 DAR1 (R6) 时相似。农业分析实验室可以使用这些大豆叶或叶柄钾浓度的充足方程,以及种植日期和成熟组信息,来解释大豆钾的充足率。