One Question per Day on the Basic Knowledge of Compound Fertilizers and Functional Fertilizers – 86

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True or False: 1. The critical nutrient period refers to the stage in a crop’s growth cycle during which, although the amount of nutrients required is not large, their absence, excess, or imbalance can have a significant negative impact on the crop’s growth and development. For most crops, the critical period generally occurs in the early stages of growth; the critical period for phosphorus appears early, followed by nitrogen, and potassium later. （ ） 2. The critical value is the nutrient concentration at which, when it is below this level in the crop, its growth rate or yield decreases significantly, and symptoms of nutrient deficiency appear; this nutrient concentration is referred to as the \"nutritional critical value\". ( ) In the compound fertilizers and functional fertilizers section, a daily quiz on basic production knowledge is carried out. We hope that all sea friends will participate actively. The purpose of this activity is to review the knowledge we have already learned, and to improve and strengthen everyone’s fundamental theoretical knowledge through answering questions, thereby reinforcing what we already know and helping us recall what we have forgotten. The top 50 answerers will definitely receive a reward. Please reply with the answer hidden; otherwise it will be invalid. To view the hidden method, go to: http://bbs.hcbbs.com/thread-492556-1-1.html. Please do not edit after replying! 1、√ 2、√