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Green beans

Green bean fertilizer application tables according to soil types

green bean fertilizer micro nutrient requirements

Green bean fertilizer requirements can be calculated if you know your soil type and have a good idea of the yield potential of your land and climate. These are basic norms and your specific microclimate and variety can have an influence on the total amount applied. These norms do not take top dressings into account, only the total amount of N, P and K applied during the growth season. The fertilizer can be applied either through the irrigation system or as granular fertilizer. Consult your supplier on the effectiveness of these fertilizers on the various soils to make adjustments to these amounts.

Three soils are used in these tables:

  • S/SL – Sandy to Sandy Loam
  • SL/S – Sandy Loam to Sand
  • SCL/C – Sandy Clay Loam to Clay

Nitrogen (N) application

Green bean fertilizer requirement ito nitrogen is easy. You don’t need a soil analysis just a good idea of your yield potential in the area. Be careful not to overestimate your potential yields as too much nitrogen will also have a negative effect on total yield and the quality of the pods. High nitrogen content makes the plant more susceptible to insect damage and diseases.

Yield target t/ha S/SL SL/S
0-10 120-140 100-120
11-15 140-180 120-160
15-20 180-220 160-220

Phosphorus (P) – (Bray 1)

Phosphorus fertilizer requirements are based on Bray 1 lab analysis. If another method is used the values must be adjusted. The minimum amount applied is always about 20 kg P per hectare as P is not that mobile and a certain level of P must always be maintained in the soil.

P analysis (ppm) Yield target 5-18 t/ha Yield target 18+ t/ha
1-10 120-140 140
11-20 100-120 112
21-30 80-100 88
31-40 80-100 88
 41-60 40-60 48
 61-80 20-40 35
 81-100 0-20 20
 101-120 20 20
121-200 20 20

Potassium (K)

Potassium requirements are based on a soil analysis and yield estimates. Potassium is extremely important for flower formation and water regulation. Over fertilization can increase the salt content of the soil to such an extent that water uptake is reduced. Note that low nitrogen soil content will impair the translocation of potassium to other parts of the plant. A potassium deficiency in the plant will not be noticed as quickly as nitrogen or iron. Deficiency symptoms occur first in the older leaves as potassium is transferred to younger leaves first. Note that beans are sensitive to salt stress, so too high applications can reduce yields.

Soil type Soil analysis Yield t/ha
ppm 0-10 11-15 16-20
S/LS 1-20 140 160 180
SL/L 1-30 140 160 180
SCL/C 1-40 140 160 180
S/LS 12-40 118 134 150
SL/L 31-60 118 134 150
SCL/C 41-80 118 134 150
S/LS 41-60 96 108 120
SL/L 61-90 96 108 120
SCL/C 81-120 96 108 120
S/LS 61-80 74 82 90
SL/L 91-120 74 82 90
SCL/C 121-160 74 82 90
S/LS 81-100 52 56 60
SL/L 121-150 52 56 60
SCL/C 161-200 52 56 60
S/LS 101-121 30 30 30
SL/L 151-180 30 30 30
SCL/C 201-240 30 30 30
S/LS 121+ 0 0 0
SL/L 180+ 0 0 0
SCL/C 241+ 0 0 0

 

Below is the well known soil texture triangle on which the recommendations are based. Most commercial agricultural soils are found in the left bottom corner as they are the most productive and provide the plant with best yield potentials.

Soil textural triangle.1)https://commons.wikimedia.org/wiki/File:USDA_Soil_Texture.svg by Christopher Aragón

 

 

References   [ + ]

1. https://commons.wikimedia.org/wiki/File:USDA_Soil_Texture.svg by Christopher Aragón

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