Indicator plants, Methods of fertilizer recommendations to crops
Indicator plants:-
i. Clear Deficiency indicator plants:-
ii. Clear Toxicity indicator plants:-
Methods of fertilizer recommendations to crops:-
- For preparing the fertilizer recommendation norms for each class of soil test values, (low, medium, high) crop response curves are to be prepared. This may be prepared for a particular situation or may be the average of a number of experiments in which climate, soil and the operator varied.
- Soil testing interpretation involves economics because it is used to make a fertilizer recommendation for an economic goal i.e. usually for maximum profit per hectare of land. This involves the cost of the fertilizer and price of the produce. From the response curve the actual amount of fertilizers can be calculated to give the maximum profit per hectare.
- In the absence of crop response curve, the fertilizer needed for maximum yield can be evaluated with maximum field experiments. For the soil with maximum soil test values and soil in which practically no fertilizer response is obtained should be included.
- The fertilizer need for maximum yield at different fertility index is determined. This will give a linear relationship. The curve may be used as a base line for recommendation of fertilizer at different soil test values or fertility index. As a thumb rule two-third of the amount needed for maximum yield is considered as the most economic rate.
- Including the soil test values the most economic rate of fertilizer will depend upon many other factors whose interpretation mainly depend upon personal judgements.
For recommending fertilizer dose, the following points should be considered:-
i. Initial fertility status of soil
ii. Additional produce and the price of the additional produce
iii. Cost of fertilizer
iv. Farm management quality
v. Productive potentiality of the land
vi. Possibility of risk involved
vii. Availability of the fertilizer
viii. Crops to be grown
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