Model calculations for the effects of nitrogen, phosphorus, and potassium nutrition on the behaviour of potato tubers in storage

1995 ◽  
Vol 38 (1) ◽  
pp. 87-96 ◽  
Author(s):  
H. Kolbe ◽  
Wei-Li Zhang
Keyword(s):  
Potato Tubers ◽  
Potassium Nutrition ◽  
Model Calculations ◽  
Phosphorus And Potassium ◽  
Nitrogen Phosphorus

Effect of nitrogen, phosphorus and potassium application on yield of potato tubers (Solatium tuberosum L.)

1987 ◽  
Vol 108 (2) ◽  
pp. 321-329 ◽  
Author(s):  
U. C. Sharma ◽  
B. R. Arora
Keyword(s):  
Field Experiments ◽  
Sandy Loam ◽  
Farmyard Manure ◽  
Potato Tubers ◽  
Solatium Tuberosum ◽  
Loam Soil ◽  
Potassium Application ◽  
Phosphorus And Potassium ◽  
Grade Increase ◽  
Nitrogen Phosphorus

SummarySix field experiments, three each during 1982–3 and 1983–4, were conducted on a sandy loam soil to study the effect of varying levels of nitrogen, phosphorus and potassium, in the absence and presence of farmyard manure (FYM) (30 t/ha), on the number of tubers and yield of potato in three grades. Increase in nitrogen, phosphorus and potassium application, in the absence or presence of FYM, did not significantly affect the total number of tubers/m2 but did affect the number of tubers in different grades. An increase in nitrogen and potassium significantly decreased the number of tubers/m2 in small (< 25 g) and increased in medium (25–75 g) and large (> 75 g) grades at 45, 60, 75 and 90 days after planting. Increase in the application of phosphorus increased the number of tubers/m2 in the small grade and decreased it in the large grade but did not affect the number in the medium grade. Increase in nitrogen and potassium application decreased the tuber yield in the small grade and increased it in the medium and large grades. Applied phosphorus increased the yield in the small and medium grades and decreased it in the large grade. The increase in the yield of tubers with increase in nitrogen and potassium application was found to be caused by an increase in the number of tubers in the medium and large grades at the expense of the small grade; however, with applied phosphorus the increase in yield was due to increase in the weight of individual tubers within the small and medium grades. FYM application decreased the number of tubers in the small grade and increased it in the medium and large grades. The response of potato to nitrogen increased and to phosphorus and potassium decreased with the application of FYM.

scholarly journals Accumulation of macronutrients and productivity of potato with foliar application of biofertilizer

2021 ◽  
Vol 48 (2) ◽  
pp. 70-82
Author(s):  
Lucas Pinheiro Araújo ◽  
◽  
Roberta Camargos Oliveira ◽  
Regina Maria Quintao Lana ◽  
JOSÉ MAGNO QUEIROZ LUZ ◽  
...  
Keyword(s):  
Organic Compounds ◽  
Foliar Application ◽  
Chemical Fertilizer ◽  
Soluble Solids ◽  
Plant Metabolism ◽  
Potato Tubers ◽  
Maximum Accumulation ◽  
Positive Effects ◽  
Phosphorus And Potassium ◽  
Nitrogen Phosphorus

The addition of organic compounds to fertilizers has shown positive effects on plant metabolism. This study aimed to evaluate the macronutrient accumulation and productivity of potato with the use of biofertilizer (BF) applied to the leaves. A 2×7 factorial plot with a plot subdivided in time and ten replications used two forms of fertilization: a chemical fertilizer with conventional NPK (nitrogen, phosphorus and potassium: control) and conventional fertilizer plus biofertilizers (BF); evaluations were performed 31, 41, 51, 61, 71, 81 and 91 days after planting (DAP) using the Jelly cultivar. The BF increased the maximum N, K, Ca and Mg accumulations in the leaves, especially N and K, with the period of greatest accumulation occurring between 62 and 66 DAP. The accumulations of N, P, K, Ca and Mg in the tubers accelerated from 71 DAP. At the end of the cycle (e.g., 91 DAP), the increases in the nutrient accumulations of N, P, K and Ca were between 30 and 64% higher for the BF application, the Mg accumulations doubled and the S accumulations exhibited no differences between the evaluation periods. For the leaves, the following decreasing sequence of maximum accumulation was observed: K>N>Ca>Mg>S>P. For the tubers, the following decreasing sequence was obtained: K>N>P>Ca>Mg>S. The use of biofertilizers caused higher productivity of tubers of greater caliber and soluble solids contents in the cv. Jelly potato tubers.

scholarly journals Nitrogen, phosphorus and potassium nutrition on ornamental Ipomoea purpurea growth

Agrarian ◽  
2021 ◽  
Vol 14 (51) ◽  
pp. 36-42
Author(s):  
Armando Reis Tavares ◽  
Letícia Rico Strafacci ◽  
Karina Gonçalves Gonçalves Da ◽  
Shoey Kanashiro ◽  
Mauricio Lamano Ferreira
Keyword(s):  
Potassium Nutrition ◽  
Ipomoea Purpurea ◽  
Phosphorus And Potassium ◽  
Nitrogen Phosphorus

O estudo objetivou avaliar o efeito de nitrogênio, fósforo e potássio no crescimento de I. purpurea. As plantas foram fertilizadas semanalmente com 50 mL de solução nutritiva modificada de Hoagland & Amon (1950): Nitrogênio com 0; 0,0888; 0,201; 0,6003 ou 1,801 g L-1 de nitrato de amônio; Fósforo com 0; 2,1; 5,5; 10,3 ou 13,5 mL L-1 de ácido fosfórico e Potássio com 0; 0,3728; 1,1183; 1,8638 ou 2,2065 g L-1 de cloreto de potássio. I. purpurea apresentaram alta demanda por N, que resultou em  aumento da área foliar. A maior concentração de N promoveu investimento preferencial nas áreas fotossintéticas, confirmado pela relação folha/raiz. I. purpurea é responsiva a fertilização com fósforo, principalmente para promover o crescimento de caule e raízes. I. purpurea não respondeu à fertilização com K. Os resultados do estudo recomendam a fertilização com 0,2001 g L-1 de nitrato de amônio e 5,5 ml L-1 de ácido fosfórico no cultivo de I. purpurea.

Use of Wastewater for Woodworking Enterprises for Obtain a Prolonged-Action Complex Fertilizer

2018 ◽  
Vol 22 (5) ◽  
pp. 46-49
Author(s):  
S.V. Lukashov ◽  
V.P. Gamazin
Keyword(s):  
Urea Formaldehyde ◽  
Maximum Yield ◽  
Molar Ratio ◽  
Formaldehyde Resin ◽  
Prolonged Action ◽  
Potassium Nutrition ◽  
Cesium 137 ◽  
Insoluble Polymer ◽  
Phosphorus And Potassium ◽  
Nitrogen Phosphorus

The results of research on the optimal conditions for obtaining a prolonged-action complex fertilizer from wastewater from woodworking enterprises are presented. The main active substance of the fertilizer is a nitrogen-containing insoluble polymer, obtained by polycondensation of urea-formaldehyde resin with urea. To produce the finished product, the resulting polymer is mixed with ash. It was found that the maximum yield of a prolonged-action complex fertilizer based on the urea-formaldehyde polymer is achieved under the following conditions: pH = 2,0, molar ratio of formaldehyde: urea 1,0: 1,5, reaction time 3,5–4,0 h. It is shown that the fertilizer obtained can be used in agriculture to improve the nitrogen, phosphorus and potassium nutrition of plants, as well as to reduce the intake of cesium 137 radionuclides into agricultural products.

Variation in grain yield, and nitrogen, phosphorus and potassium nutrition of irrigated rice cultivars grown at fertile and low-fertile soils

2018 ◽  
Vol 434 (1-2) ◽  
pp. 107-123 ◽  
Author(s):  
D. S. Kekulandara ◽  
D. N. Sirisena ◽  
P. C. G. Bandaranayake ◽  
G. Samarasinghe ◽  
M. Wissuwa ◽  
...  
Keyword(s):  
Grain Yield ◽  
Rice Cultivars ◽  
Irrigated Rice ◽  
Potassium Nutrition ◽  
Phosphorus And Potassium ◽  
Nitrogen Phosphorus

scholarly journals Effect of Organic Fertilization Treatment, Frying Oil and Cultivar Variety on the Volatile Profile of Potato Tubers

2016 ◽  
Vol 4 (1) ◽  
pp. 01-08 ◽  
Author(s):  
A. Nikolaou ◽  
T Varzakas ◽  
Y Kourkoutas
Keyword(s):  
Carbonyl Compounds ◽  
Corn Oil ◽  
Principal Component ◽  
Frying Oil ◽  
Control Treatment ◽  
Potato Tubers ◽  
Organic Fertilization ◽  
Phosphorus And Potassium ◽  
High Fertilization ◽  
Nitrogen Phosphorus

The effect of organic fertilization and frying oil (olive, soybean and corn oil) on the volatiles’ profile of three potato cultivars (Voyager, Spunta and Lady Rosetta) was studied. During cultivation, nine treatments (T) involving the combination of nitrogen, phosphorus and potassium fertilization were applied: T1: control treatment; T2: N1, P1, K1; T3: N1, P1, K2; T4: N1, P2, K1; T5: N1, P2, K2; T6: N2, P1, K1; T7: N2, P1 K2; T8: N2, P2, K1; and T9: N2, P2, K2, where Ν1=1.3 g Ν per plant; N2=2.0 g Ν per plant; P1=3.1 g P2O5 per plant; P2=5.2 g P2O5 per plant; Κ1= 4.0 g K2O per plant; and Κ2= 6.6 g K2O per plant. The main volatile compounds identified by HS-SPME GC/MS analysis were esters, alcohols, carbonyl compounds and hydrocarbons. Principal Component Analysis revealed that nitrogen fertilization affected the volatiles’ profile only when high fertilization of P2O5 (5.2 g/plant) and K2O (6.6 g/plant) was applied.

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