AP BIOLOGY

Detailed explanation-1: -To calculate the pounds of nitrogen in a bag of fertilizer, multiply the weight of the bag by the percent nitrogen (this is the first number in the N-P-K designation on the front of the bag). This will tell you the pounds of nitrogen in the bag.

Detailed explanation-2: -Multiply the amount of fertilizer you are applying (3.8 lb per 1000 sq ft) by the percentage of phosphate in the bag (5%). Do the same for potash (10%). Remember to convert the percentages of phosphate and potash to their decimal forms.

Detailed explanation-3: -AVANTAGE (18-18-18) Water-soluble fertilizer, foliar or soil applied. Recommended for the fruiting stages of fruit trees, vegetables and for flowers and ornamentals. Avantage (18-18-18) is totally water-soluble and suitable for all soil types and for all environmental conditions (cold and hot weather).

Detailed explanation-4: -Soil test recommendations are given in lb/ac or kg/ha of nutrients. To determine the fertilizer rate for a particular nutrient, multiply the rate of the desired nutrient by 100 and divide by the percentage of the nutrient in the fertilizer.