"Excess nitrogen doesn't visibly affect plants and there isn't much effect on yields unless the levels are absurdly high." But, says Shen, too much nitrogen causes plants to grow too densely, making them more vulnerable to rice blast. This makes the rice far more vulnerable to storms-heavy winds and rains can blow down an entire field of infected plants.
但是氮肥用量除非高得太離譜，否則農友目測看不出來，對產量的影響也不大，」申雍比喻，就像人虛胖一樣，氮若施的過多，植株反倒會因長的太過茂密而容易罹患稻熱病，遇到刮風大雨時，稻穗往往整片倒伏，讓農民猝不及防。