Abstract
Abstract: The objective of this work was to evaluate the effect of humic substances (HS) and phosphorus fertilizer on the growth, P uptake, tuber yield, fertilizer P recovery (FPR), and applied P-use efficiency (APUE) of potato (Solanum tuberosum) cultivated in a sandy and in a clayey soils. In both soils, the experiment was carried out in a randomized complete block design, in a 4×3 factorial arrangement, with four replicates. The treatments consisted of four P rates (0, 100, 200, and 400 kg ha-1 P2O5) and of three HS rates (0, 50, and 300 L ha-1). Phosphate fertilization increased the P uptake and tuber yield of potato in both soils. Soil characteristics conditioned the effect of the addition of HS. In the sandy soil, with a lower content of organic matter (OM) than the clayey soil, the addition of HS increases the P uptake and FPR, besides providing a greater tuber yield and APUE, especially under the P absence or with the application of a reduced P rate. In the clayey soil, HS does not affect the response of potato to P fertilization.
Highlights
Potato (Solanum tuberosum L.) cultivation is highly demanding for nutrients available in the soil because of its short cycle, high growth rate, and high yield per unit of area (Fernandes et al, 2011; Fleisher et al, 2013; Fernandes & Soratto, 2016a)
The objective of this work was to evaluate the effect of humic substances (HS) and P fertilizer on the growth, P uptake, tuber yield, fertilizer P recovery (FPR), and applied P-use efficiency (APUE) of potato cultivated in a sandy and in a clayey soils
Only in the absence of P fertilization, in the sandy soil, the leaf P concentration was below the range considered suitable for potato by Lorenzi et al (1997)
Summary
Potato (Solanum tuberosum L.) cultivation is highly demanding for nutrients available in the soil because of its short cycle, high growth rate, and high yield per unit of area (Fernandes et al, 2011; Fleisher et al, 2013; Fernandes & Soratto, 2016a). Phosphorus (P) ranks first among the macronutrients whose deficiencies are most limiting for potato yield in tropical soils (Luz et al, 2013; Fernandes & Soratto, 2016a, 2016b). This occurs because the recovery of fertilizer P by plants is usually very low due to the high capacity of soils to adsorb/bond P to soil constituents, especially in acid clayey soils (Falcão & Silva, 2004; Novais et al, 2007). High rates of P fertilizer have been applied in potato cultivation, and the use efficiency of applied P is usually low (Luz et al, 2013; Fernandes & Soratto, 2016a)
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