The principle of reducing the yield increase caused by excessive fertilization is: the law of diminishing returns.
The remuneration from a certain land increases with the increase of the labor and capital invested in the land, but after reaching a certain level, the remuneration is gradually decreasing as the unit labor and capital invested increase. . The same applies to crop fertilization. When the amount exceeds the appropriate amount, the yield increase of the crop shows a decreasing trend. When the limit is exceeded, the crop does not increase or even begins to decrease.
The reason why excessive fertilization leads to crop yield reduction is not to be overlooked, that is, physiological diseases are aggravated.
On the one hand, soil salinization, alkalization, acidification, sanding, and slab formation caused by soil pollution can directly or indirectly cause crops to produce physiological diseases, aggravating the pathological conditions of crop bacterial diseases and viral diseases, thereby causing crop yield reduction.
On the other hand, excessive fertilization is likely to cause crop malnutrition (or nutritional antagonism), which leads to aggravation of crop physiological diseases, and production is almost a foregone conclusion. The nutritional imbalance caused by excessive fertilization is over-nutrition, and the second is the lack of other elements due to the excess of certain elements. For example, ammonium excess inhibits the absorption of potassium and magnesium. Even if the soil is not deficient in potassium and magnesium, crops sometimes show potassium deficiency and magnesium deficiency. Excessive phosphorus, that is, when the plant P/Zn value is ≥400, zinc deficiency occurs.
Common physiological diseases of crops include: roots and burned seedlings; falling flowers and fruit falling; leaves chlorotic and malformed; leafy leaves withered; small leaves clumped and clustered; plants short and weak; stems and vines short; growth point necrosis; and many more.
China Agricultural Materials Weekly
The remuneration from a certain land increases with the increase of the labor and capital invested in the land, but after reaching a certain level, the remuneration is gradually decreasing as the unit labor and capital invested increase. . The same applies to crop fertilization. When the amount exceeds the appropriate amount, the yield increase of the crop shows a decreasing trend. When the limit is exceeded, the crop does not increase or even begins to decrease.
The reason why excessive fertilization leads to crop yield reduction is not to be overlooked, that is, physiological diseases are aggravated.
On the one hand, soil salinization, alkalization, acidification, sanding, and slab formation caused by soil pollution can directly or indirectly cause crops to produce physiological diseases, aggravating the pathological conditions of crop bacterial diseases and viral diseases, thereby causing crop yield reduction.
On the other hand, excessive fertilization is likely to cause crop malnutrition (or nutritional antagonism), which leads to aggravation of crop physiological diseases, and production is almost a foregone conclusion. The nutritional imbalance caused by excessive fertilization is over-nutrition, and the second is the lack of other elements due to the excess of certain elements. For example, ammonium excess inhibits the absorption of potassium and magnesium. Even if the soil is not deficient in potassium and magnesium, crops sometimes show potassium deficiency and magnesium deficiency. Excessive phosphorus, that is, when the plant P/Zn value is ≥400, zinc deficiency occurs.
Common physiological diseases of crops include: roots and burned seedlings; falling flowers and fruit falling; leaves chlorotic and malformed; leafy leaves withered; small leaves clumped and clustered; plants short and weak; stems and vines short; growth point necrosis; and many more.
China Agricultural Materials Weekly
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