The pH scale indicates acidity or alkalinity. A soil with a pH number below 7 is acid, while one with a pH above 7 is alkaline. Garden plants typically grow best in neutral or slightly acid soil (pH 7 or slightly below; see illustration at left).f your soil is extremely acidic or alkaline and you need to change the level by more than one point on the pH scale, it's best to bring in a professional: he or she can both analyze test results and perform an on-site evaluation to determine whether the soil can be amended successfully and how best to go about it.
There are two different types of vitamin A. The first type, preformed vitamin A, is found in meat, poultry, fish, and dairy products. The second type, provitamin A, is found in fruits, vegetables, and other plant-based products. The most common type of provitamin A in foods and dietary supplements is beta-carotene.
A cup of sour red cherries provides 793 micrograms of beta-carotene, while a cup of sweet cherries has only 52 micrograms. Citrus. Among citrus fruits, pink or red grapefruits have the most beta-carotene, offering 844 micrograms per half of one fruit; white grapefruit has only 17 micrograms of beta-carotene per half fruit. A medium-sized tangerine has 136 micrograms of beta-carotene, while a medium-sized orange contains 93 micrograms and a half-cup of canned mandarin oranges packed in fruit juice and drained has 282 micrograms. Lemons and limes contain negligible amounts of beta-carotene. Tropical. A cup of fresh passion fruit has 1,753 micrograms of beta-carotene.