How urea, ammonium and nitrate behave differently in soil, and why one large dose is not the same as splitting it.
Urea is not the form the plant takes up as soon as it is applied; it transforms in the soil. Ammonium and nitrate are different forms. Nitrate moves more readily with water. Temperature and moisture change that transformation; piling the dose once and splitting it are not the same result.
Extra nitrogen is not read as extra yield.
Why calcareous soil and high pH are not the same measurement, and how high pH changes iron, zinc and phosphorus availability.
How to read NPK, micronutrients and the guaranteed analysis, and why the percentage is not the field rate.
What a leaf analysis shows that a soil analysis does not, and why sampling time and leaf choice change the reading.
How to judge compost maturity before field use: temperature, smell, salinity and the analysis, not color alone.
Why phosphorus becomes bound in soil and why raising the rate without a soil analysis is not the management.
