A researcher took soil sample from a plot 50 m × 40 m and after the appropriate tests came up a recommendation for NPK fertilization at 80 kg N/ha, 100 kg P2O5/ha and 50 K2Okg/ha. Calculate the amount of urea (46% N), triple superphosphate (45%) and potassium sulphate (48%) required to supply the required nutrients.

Which of these statements is true about autotrophs, but not heterotrophs? a. they use sugar and oxygen to make carbon dioxide and water.b. they use chlorophyll and oxygen to make carbon dioxide and water.c. they use sunlight, water, and carbon dioxide to make sugars.d. they use sunlight, water, and oxygen to make chlorophyll.