No abstract

Yields and quality were compared on young bearing ‘Bearss’ lemon (Citrus limon L.) trees grown with 3 rates of N and K and 2 levels of soil moisture over a 4-year period. Increased rates of N application increased fruit production, incidence of fruit with scab, and green fruit; and decreased acid content of juice. Potassium applications increased the acid content of juice. Irrigation increased fruit size and decreased the number of green fruit after curing. A leaf N content of 2.2 to 2.6% is suggested for optimum fruit production for ‘Bearss’ lemon under Florida conditions.

No abstract

In 1583, Joseph Justus Scaliger introduced the Julian Period of 7980 years, which is the basis of the Julian Day system of counting days sequentially from 1 January 4713 BC. It is not commonly known how this date was chosen as the origin of the system. This paper formulates the problem as an application of the theory of congruences and the Chinese Remainder Theorem. Scaliger’s interesting original solution to the problem is also reviewed.

A 5-year field experiment planted on Astatula fine sand using ‘Hamlin,’ ‘Pineapple,’ and ‘Valencia’ orange (Citrus sinensis [L.] Osbeck) on rough lemon rootstock (Citrus jambhiri Lush.) with 4 levels each of N and K indicated that higher N rates increased fruit production and yield of soluble solids. High K applications decreased soluble solids. Increase in tree canopy area between 1968 and 1974 was related to N but not to K applications. Maximum yield response with N in all 3 cultivars was attained at 202 kg/ha/yr. ‘Hamlin’ orange showed maximum yield response to K at 167 kg/ha/yr whereas ‘Pineapple’ and ‘Valencia’ orange had maximum yield at 112 kg/ha/yr. Leaf analyses showed that increased N application resulted in higher leaf N and Mg contents but lower P and K levels. Increased K application showed higher P and K levels but lower Ca and Mg levels.