Lemon Alkaline Food.

From a food science point of view, lemon is an alkaline food. However, because lemon contains citric acid, people generally mistake lemon as an acidic food. The reason why it is an alkaline food is that although lemons contain citric acid, citric acid is completely metabolized in the body to generate carbon dioxide and water, and with the carbon dioxide exhaled out of the body, the acidity is eliminated.

While the potassium and calcium ions in lemons remain in the body in the form of metal cations, these ions can be combined with acid ions, which can reduce the acidity of the urine, so it is known as alkaline food; not only lemons, the majority of fruits are alkaline food.

Lemon is a small tree, branches less thorny or nearly thornless, young leaves and flower buds dark purplish-red, leaf blade thick papery, ovate or elliptic; single flowers axillary or few flowers in clusters; fruit ellipsoid or ovate, thick rind, usually rough, lemon-yellow, the juice is acidic to very acidic, the seeds are small, ovate, pointed at the end; the seed coat is smooth, the cotyledons creamy-white, usually single or both polyembryo.

It prefers warmth, tolerates shade, does not tolerate cold, and is also afraid of heat. Native to Southeast Asia, the main places of origin are the United States, Italy, Spain and Greece.

Lemons like warmth, shade, not cold, also afraid of heat, therefore, suitable for cultivation in subtropical areas with warm winters and cool summers. Lemon suitable for the average annual temperature of 17-19 ℃, the annual effective cumulative temperature (≥ 10 ℃) in more than 5500 ℃, the average temperature in January 6-8 ℃, the extreme minimum temperature higher than -3 ℃; annual rainfall of more than 1,000 millimeters, more than 1,000 hours of sunshine per year.