Sweet Potato Response to K and P Fertilization1
Sweet Potato Response to K and P Fertilization1
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甘薯对钾肥和磷肥的反应1
DOI：
10.2134/agronj1985.00021962007700030024x
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发表时间：
1985
期刊：
影响因子：
2.1
通讯作者：
D. W. Eaddy
中科院分区：
文献类型：
--
作者：
J. J. Nicholaides;H. Chancy;H. Mascagni;L. G. Wilson;D. W. Eaddy
目前，国内外对甘薯钾素来源、钾素用量和磷素用量的研究较少。拉姆。]生产因此，许多种植者，继续使用更昂贵的硫酸盐（SO ↓ [2]）来源的K，而不是氯化物（Cl）和高于推荐的速率的K和P。因此，在农场实验进行了为期3年的北卡罗来纳州Paleudults，以确定影响的K源和速率和Prate甘薯产量，等级和质量。钾源为KCl和K2 SO 4。在5个钾肥试验中，钾肥的施肥量各不相同，并取决于Mehlich-I提取剂测定的初始土壤测试水平，范围为0.04至0.12 cmol K L。在三个磷试验中，不同的磷率也取决于初始土壤测试水平，其范围为11至30 mg P/L，也由Mehlich-I提取剂。由于钾源对产量、等级或品质没有影响，因此可以得出结论，随着KCl施用量的增加，营养组织中较高的Cl浓度（高达22.8 g kg·hm-2）对甘薯产量、等级或品质没有不利影响。当土壤供钾水平≤ 0.08 cmol L时，获得了对钾肥施用的总产量响应，尽管1号产量仅在土壤供钾水平≤ 0.05 cmol L时增加。施磷对甘薯的产量、等级和品质没有影响。
Limited literature is available to provide recommendations of K source and rate and P rate for sweet potato [Ipomoea batatas (L.) Lam.] production. Many growers, therefore, continue to use the more expensive sulfate (SO₄) source of K rather than chloride (Cl) and higher than recommended rates of K and P. Accordingly, on-farm experiments were conducted during 3 years on North Carolina Paleudults to determine effects of K source and rate and Prate on sweet potato yield, grade, and quality. Potassium sources were KCl and K₂S0₄. Fertilization rates of K varied over the five K experiments and depended on initial soil test levels which ranged from 0.04 to 0.12 cmol K L⁻¹ by Mehlich-I extractant. In the three P experiments, the various P rates were also dependent upon the initial soil test levels which ranged from 11 to 30 mg P L⁻¹ also by Mehlich-I extractant. As K source had no effect on yield, grade, or quality, it was concluded that the higher Cl concentrations, up to 22.8 g kg⁻¹, in vegetative tissue with increasing KCl rates had no detrimental effect on sweet potato yield, grade, or quality. Total yield response to K applications was obtained where soil test K levels were ≤ 0.08 cmol L⁻¹, although no. 1 yields increased only where soil test K levels were ≤ 0.05 cmol L⁻¹. Phosphorus applications had no effect on yield, grade, or quality of sweet potato.