NAR is a crop nutrition diagnostic technique that is exclusive to INM Pty. Ltd., its agents, and its distributors. It is the epitome of a series of improvements in diagnostic skills.
COMMONLY USED SYSTEMS OF INTERPRETATION:
There are 2 main systems of interpreting plant tissue analytical data. The traditional one is based on the so-called critical level approach. This system interprets data by taking into consideration one mineral at a time. It totally ignores nutritional balances and interactions. Its criteria are extremely specific to particular geographical parameters and specific timing for sampling.
The other, less commonly used systems are based on mineral balance. The concept was introduced in the early 1970s, and many such systems were developed. Whilst those systems take into account nutritional balances, their major fault is that they invariably ignore the absolute levels of minerals. They fail to see the difference between nutritional balance at low absolute levels of minerals and that at high absolute levels of minerals. If for argument sake the ratio of phosphorus to nitrogen in a particular crop is 1:10, then in such systems, it would not make any difference if the levels of phosphorus and nitrogen were 0.1 and 1 or 0.3 and 3. Another great flaw in such systems is that they invariably suggest unrealistic target levels for certain minerals. If a certain crop, for example, has an extremely high level of a certain mineral, such systems of interpretation will then suggest that all other minerals will need to be unrealistically high in order to match it. In some such instances, such systems could suggest nitrogen levels as high as 7-8.
PROBLEMS OF THE CRITICAL LEVEL APPROACH:
PROBLEMS OF THE BALANCE APPROACH:
PHYSIOLOGICAL NEEDS VS. MARKET EXPECTATIONS:
Both commonly used systems of interpretation fail to distinguish between physiological needs of crops and market expectations. In practical terms, a proper nutritional diagnosis has to be based on economic grounds, and not on growing happy plants per se.
It is very important to note that both over mentioned systems have criteria and standards, which are yield-based. Whilst so much emphasis is being increasingly put on quality issues, the above systems are unable to interpret analytical data from quality perspectives.
The Nutritional Assessment Report (NAR) is a very advanced diagnostic skill. The advantages of the NAR are many. They include the following:
FERT-CAL is a very high analysis fertigation calcium product that is based on an organic acid chelate base. It is a straight calcium product and does not contain any other essential element and thus its application will only favour calcium balance. It is ideal for situations where foliar calcium applications are not enough and/or when they cannot be done due to weather or other conditions.