Crops go through many different stages of growth from seed germination to seed formation. In the whole fertility process, except for the seed nutrition and the roots at the end of the germination, the crops must pass through the root system. As time goes by, the absorption of nutrients gradually increases, and during the maturity period, it tends to cut back.
The peaks of nutrient uptake and the number and proportion of nitrogen, phosphorus and potassium absorbed during each growth period are also different for different crops. For example, the peak of wheat nitrogen is in the jointing stage of i, while the amount of nitrogen in the flowering stage is less; the peak of nitrogen uptake by cotton is from the initial flowering stage to the full flowering stage. There are two key periods for general crop nutrition, namely the critical period of crop nutrition and the maximum efficiency period of crop nutrition.
Critical period of crop nutrition
The critical period of crop nutrition refers to the period in which a certain nutrient deficiency, excessive or improper proportion has the greatest impact on crop growth. In the critical period, although the absolute quantity of crops for a certain nutrient demand is not large, it is very urgent. If a certain nutrient is lacking, excessive or improperly distributed, it will be difficult to make up even if the nutrient supply is normal in the future.
The critical period of nutrition for various crops is exactly the same, but it occurs mostly in the early stage of crop growth. The critical period of phosphorus nutrition in most crops occurs in the seedling stage, corn. About 7 days after emergence, cotton is 10-20 days after emergence. The crop seedling stage is the turning point of seed nutrition to soil nutrition. At this time, the phosphorus nutrition of the seed is almost exhausted, and it is urgent to obtain phosphorus nutrition from the soil, but at this time, most of the young roots are on the soil surface, and have not been stretched and absorbed. Nutrient bear strength is weak.
A small amount of phosphate fertilizer is used as a seed fertilizer in agricultural production, and often has good effects. The critical period of crop nitrogen nutrition is generally later than the critical period of phosphorus nutrition, and often shifts from vegetative growth to reproductive growth, such as wheat in the tillering to young panicle differentiation stage, and cotton is in the early stage of bud. The critical period of potassium nutrition in rice is in the early stage of tillering and the stage of spike differentiation.
Maximum efficiency of crop nutrition
The maximum efficiency of crop nutrition refers to the period during which a certain nutrient can exert maximum yield. During this period, crops have the most demand and absorption of certain nutrients. During this period, it was also the most vigorous period of crop growth. The ability to absorb nutrients was extremely strong. If the nutrient demand of crops was met in time, the yield increase effect was very significant.
The maximum efficiency of nitrogen nutrition in maize is generally from the trumpet stage to the early stage of tasseling; the wheat is in the jointing stage to the heading stage; the cotton is in the flowering and bolling stage; the rapeseed is in the flowering stage. The critical period of crop nutrition and the maximum efficiency period of crop nutrition are two key fertilization periods in the whole nutrition period of the crop, but the continuous characteristics of the nutrient absorption of the crop can not be ignored.
This article URL: Nutritional Needs Characteristics of Crops in Different Periods
YT-S350
YT-S350
Shenzhen Sunshine Technology Co.,Ltd , https://www.szyatwin.com