Field testing of micronutrient fertilizers

How to get a reliable field test of micronutrient fertilizers :

Testing of micronutrient fertilizers is particularly sensitive because yield differences may be narrow. Therefore, avoidable errors must be kept low if yield responses are to be analyzed at 5% probability level. Large scale testing is not suitable for yield potential evaluation. Though protocols vary with the nature of material being tested, some minimum requirements must definitely be followed. This includes (i) maintaining equal populations in all test plots, (ii) equalizing N, P, K, S and Mg applications in all plots, (iii) accurate weighing of fertilizers for each individual plot and (iii) careful harvesting and accurate weighing of produce.