|Limited trials have indicated that ear sterility is associated with boron deficiency. As a precaution "C" mixture which is boronated is recommended for basal dressing instead of "D" mixture. Where soil analysis or past experience have shown no boron deficiency "D" mixture could be used as it contains more nitrogen and phosphorous. A top dressing of urea or ammonium nitrate four to five weeks after planting is recommended. As a general guide these fertilizers should be used at rates calculated to provide nutrients as shown in table 24a. These recommendations are of general nature, growers are advised to take soil samples for analysis for specific recommendations. Drilling basal fertilizer with the seed is preferred to broadcasting as it improves fertilizer use efficiency. However, it is essential to ensure that seed and fertilizer do not come into direct contact. Seed drills which side band the fertilizer or place it slightly deeper are recommended. Split application of total nitrogen is recommended instead of applying all nitrogen at planting.