There are so many varieties coming in every crop. Does these varieties requirement for nutrients is same in every soil ?? If not how can we standardize recommended dose of fertilizer?
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I think that conducting field experiments with varying doses up to and down the recommended doses advised by the manufacturing company can help us to reveal the recommended dose of any fertilizer according to our crop variety and surrounding environmental conditions.
For recommending fertilizer doses the first and foremost duty is to analyze the parent soil to detect the contents of different elements (N, P, K. etc.) of that particular field soil. Because nutrient status of a soil depends on previous crop cultivated in the soil, soil type, land topography etc. Then prepare a recommendation incorporating the analytical results of that soil and the prescription (dose) of the Govt. authority for that specific area.
Before apply any fertilizers, you should be analyzed your soil then apply your fertilizers.
The fertilizers dose vary from land to land, area to area, also depend on crop, crop season, & so on.
No requirement is different.
1. Use SHC based recommendation
2. STCR based recommendation