Introduction


Plants require particular types of nutrients in specific quantities and at specific growth stages. Fertilisers are substances that supply plant nutrients and are the most effective means of increasing crop production and of improving the quality of food, fodder and ornamental plants.

Fertilisers are used in order to suppliment the natural nutrient supply in the soil, especially to correct soil deficiencies.

The use of soil teste can help to determine the status of plant available nutrients to develop fertiizer recommendations to achieve optimum crop production.

Efficient application of the correct types and amounts of fertilizers for the supply of the nutrients is ana important part of achieving profitable yield.

The most suitable type of macro- or micro-nutrient fertiliser for a prticular purpose depends on:

  • The speed of nutrient uptake desired
  • The compination of nutrients required
  • Growth-enhancing side effects such as mobilsation of other soil nutrients.

Windmill Fertilisers

Windmill supplies different types of fertilisers and these include:-

Compounds – two or more nutrients joined together in a chemical process
Blends – a combination of separate fertilisers
Straights fertilisers – supplies one or more major nutrient
Speciality fertilisers – a range of specialised fertiliser targeted at creating value for farmers
Foliar fertilisers – concentrate liquid fertiliser that contains macro and micro nutrients

Timing of fertilisers application is dependent on:-
  1. Plant type
  2. Growth stage of the plant
  3. Type of fertiliser
    Choice of application equipment
  4. Choice of application equipment
Factors affecting fertiliser use efficiency are:-
  1. Correct placement
  2. Right amount
  3. Right kind of material
  4. Correct timing
  5. Soil pH

Windmill Compounds

COMPOUND

N

P2O5

K2O

S

B

Zn

Ca

Mg

CROPS

Super C

6

24

 
20

8

0.1

 
Tobacco, Paprika, Potato, Vegetables

Compound C

5

15

12

11

0.1

6

6

 
Tobacco, Paprika, Potato, Vegetables

Compound C ‘Xtra’

5

15

12

6

0.1

 
Tobacco, Paprika, Potato, Vegetables

Compound S

7

 
21

7

6

0.7

 
Seedbeds

Compound L

4

17

11

8.5

0.25

 
Cotton, Soya, Sunflower, Groundnuts

Super D

13

 
27

13

1,53

1.8

 
Maize, Sorghum, Wheat, Barley, Beans

Compound D

7

 
14

7

9

 
Maize, Sorghum, Wheat, Barley, Beans

Compound D ‘Xtra’

7

14

7

6

6

6

 
Maize, Sorghum, Wheat, Barley, Beans

Compound D

10

 
20

10

6

 
Maize, Sorghum, Wheat, Barley, Beans

Compound Z

7

 
14

7

6.5

0.5

 
Maize, Sorghum, Wheat, Barley, Beans

Compound J

14

6

20

4

0.4

 
Coffee, Fruit Tree, Macademia, Shrubs

Compound J

15

 
5

20

4

0.4

 
Coffee, Fruit Tree, Macademia, Shrubs

Compound X

20

 
10

5

4.5

 
Lawn, Pastures, Golf Course, Sportsfield

Compound T

20

 
5

10

5

 
Tea

Super K

5

15

28

3.8

0.25

 
Soya, Sunflower, Cotton, Groundnuts


Windmill Straights


Product

N

P2O5

K2O

 %S

 Ca

Mg

 Crops

Ammonium Nitrate

34.5

 
All crops (Top dress)

Sulphate of Ammonia C

 21

 24

 
All crops (Top dress)

Super Cereal Top

 
34.5

 11

 
Maize, Sorghum, Wheat, Barley and crops requiring sulfur

CAN

 27

 
All crops (Top dress)

Urea

 46

 
All crops excluding Tobacco(Top dress)

MOP

 60
 

Paprika, Banana, Sugar cane, Vegetables (Top dress)

SOP

 
50

 18

Paprika, Potato, Vegetables (Top dress)

SSP

 19.25

Sweet potatoes

Gypsum

17.5

22

 
Groundnuts(Top dress)

MAP

 
11

50

 
Fruits, Vegetables (Top dress)


Windmill High Analysis Blends

Product

 N

 P2O5

K2O

S

 B

 Zn

 Crops

Double D

14

 28

14

 1.8

 
Maize, Sorghum, Wheat, Barley, Beans

Super D

 13

27

13

1.53

 1.8

 
Maize, Sorghum, Wheat, Barley

Cereal Blend

6

 23

23

 
Maize, Sorghum, Wheat, Barley, Beans

Veg blend

 6

 26

23

 
Tobacco, Potatoes, Horticultural crops

Veg blend

6

 28

23

6

 
0.1

Tobacco, Potatoes, Horticultural crops


B

=

 % Boron

Zn

 =

 % Zinc

Ca

 =

% Calcium

Mg

=

 % Magnesium


N.B: All figures shown are the actual nutrients expressed as percentages.