Assume it takes 15 lbs. of aluminum sulphate per 1000 sq. If your soil test indicates the pH is already 6.0, then do the calculation below assuming your results were pH 5.0 instead. An appropriate supply of nitrogen gives plants healthy dark-green foliage. It should be abundant for crops like grass, cabbage, asparagus, onions, lettuce, and spinach. Too much nitrogen, however, can cause growth to be too rapid, can cause the plant to grow tall and soft, to fall over, and can reduce yield.
Excess nitrogen can also delay and prevent flower and fruit formation in other crops.
Plants lacking sufficient nitrogen will be short, thin, and yellowish green, particularly in the lower leaves. The leaves will turn yellow, and will brown down to a crispy state. In monocots, such as grasses, the tip of the leaf browns first and the browning progresses toward the leaf sheath. A. Rinse out your microcentrifuge tube completely. D. Close the cap of the tube and, holding the cap in place with your finger, shake the tube gently for 30 seconds.