Nitrogen and Potassium Fertilization Responses of Potato (Solanum tuberosum) cv. Spunta

Abstract

A potato field experiment was conducted for 2 consecutive years to determine the effects of nitrogen (N) and potassium (K) fertilization rates on the yield and quality of potato cv. Spunta cultivated on soil low in N and K. A 3 × 4 complete factorial experiment was used with three rates of nitrogen (330, 495, and 660 kg N ha -1 ) and four rates of potassium (112, 225, 450, and 675 kg K 2 O ha -1 ). An additional treatment without fertilization was used as the control. On soils low in N and K, potatoes showed low yield response to K fertilizer. The greatest tuber yields for both years were achieved at 495 kg N ha -1 and 112 kg K 2 O ha -1 (29.81 t ha -1 ) and 225 kg ha -1 (27.13 t ha -1 ), respectively. Differences in mean fresh weight due to treatment application were not significant. Application of 495 kg N ha -1 significantly reduced harvest index (the ratio of tuber dry weight to the total dry weight at harvest) compared to 330 kg N ha -1 , but at 660 kg N ha -1 harvest index achieved the greatest significant value. Potassium fertilization had no significant influence on harvest index. Nitrogen rates positively influenced the number of tubers. The addition of 450 kg K 2 O ha -1 significantly enhanced the number of tubers compared to the lower K rates, and the number was significantly decreased by the application of 675 kg K 2 O ha -1 . Tuber dry-matter concentration was significantly promoted by N fertilization in both cultivation years, but it was negatively affected by K fertilization in the first year of cultivation. There was no change in tuber N with N application, but N application strongly increased nitrate (NO 3 ) concentration, which fluctuated between 360 and 1382 mg kg -1 wet mass. Tuber NO 3 was negatively correlated with tuber yield, indicating that high levels of NO 3 in tubers can adversely affect yield. Tuber response to K fertilization was not in accordance with the rate of applied nutrient.

Potassium management in potato production in Northwest region of China

“…Potassium is a quality element. The positive effect of K fertilization is greater on tuber quality than on yield (Kavvadias et al, 2012). Potassium is partially responsible for light-colored chips characteristic through a positive influence on lowering the sugar, amino acid, and tyrosine content in potatoes, which tend to darken the chips Cummings and Wilcox, 1968).…”

Relaciones NO3-/aniones y K+/cationes en la solución nutritiva para el crecimiento de plántulas de tomate

“…There was no effect on Ca concentrations These results indicate that increasing the ratio N / K in the low and intermediate ratios K + /cations (15 and 35/100), increased Ca absorption in the leaves (Figure 1), which can be attributed to lower concentrations K, as this nutriment when present in high concentrations has a high mobility and reduces absorption of Ca (Fageria, 2001;Kavvadias et al, 2012). The concentration of N in the leaves presented a linear trend with NO 3 -/anions factor, because by increasing the percentage ratio NO 3 -/anions in the SN, the N concentrations in the leaves increased, and the highest concentration (4.93% of N) was obtained with 80/100 NO 3 -/anions and the lowest (4.42% N) was obtained with 40/100 NO 3 -/anions (Table 5).…”

“…Estos resultados indican que aumentar la relación N/K en las relaciones bajas e intermedias de K + /cationes (15 y 35/100), incrementó la absorción de Ca en las hojas (Figura 1), lo que puede ser atribuido a las menores concentraciones de K, ya que este nutrimento cuando está presente en concentraciones elevadas tiene una movilidad alta y reduce la absorción de Ca (Kavvadias et al, 2012;Fageria, 2001 / cations (higher ratio N/K) the PST significantly (p≤ 0.05). A higher dry matter content of the stems provides greater resistance to cold and less succulent to have lower water content are less brittle, so it is important to reduce stress after transplantation (Markovié et al, 1997) (Table 3), a value that may not cover the demand for N of seedlings, reducing the PSH and PSP.…”

Adubação potássica e seu efeito residual sobre a produtividade e a qualidade de tubérculos de batata

“…Entretanto, o teor de potássio residual incrementou apenas a classe de tubérculos comerciais, composta principalmente pela classe II (Tabela 2). O incremento do número de tubérculos de batata, com a fertilização potássica, ocorre principalmente em solo com baixo teor de K (Kavvadias et al, 2012;Kang et al, 2014), como confirmado no presente trabalho em solo com teor inicial de K de 38 mg dm -3 , valor interpretado como baixo para a batata.…”

“…A fertilização potássica afeta a produtividade e a qualidade de tubérculos de batata, principalmente em solos com baixa reserva de K disponível (Kavvadias, 2012). Além de aumentar a produção de tubérculos, a adição de K aumenta a matéria seca da parte área (El-Sirafy et al, 2008).…”