A. Lawn fertilization
On the one hand, it supplements the lawn’s need for mineral nutrients such as nitrogen, and on the other hand, it also focuses on fertilizing the soil. It is another important measure to get a high quality and long-lived lawn, in order to enter the virtuous cycle of “good lawn and good soil”.
1. Nutrients required by turfgrass and deficiency disease
First inhale carbon dioxide and oxygen from the body to obtain the three nutrients of carbon, hydrogen and oxygen.In addition, the necessary nitrogen, phosphorus, potassium, calcium, magnesium, sulfur, manganese, boron, copper, zinc, iron, molybdenum, chlorine and other 14 elements need to be obtained from the soil or supplemented by fertilization. The most important thing is that the lack of any one of these 17 elements means that the plant cannot grow and develop normally
2. Complete life history
No element can be replaced by other elements, and the effect is direct. Therefore, the International Society of Plant Nutrition recognizes these elements as essential nutrients. Carbon, hydrogen, oxygen, nitrogen, phosphorus, potassium, sulfur, calcium, magnesium, etc., accounting for ≥ 0.01% of the weight of dry matter in the plant, called large elements. The rest are trace elements. In addition, there are still “beneficial elements” silicon, cobalt, selenium, sodium, etc. in the soil to obtain, often feel the lack of. That is, the need for fertilization often supplemented by nitrogen, phosphorus, potassium, commonly known as the three elements of fertilizer. Generally speaking, only in special soils and environments, the need to supplement other nutrients.
3. The nutrient requirements of lawns
Compared to crops and even forage grasses, it is quite distinctive. Nitrogen requirements are particularly high, potassium requirements are extraordinary, phosphorus requirements are relatively low, and other elements are also required across the board. Therefore, fertilization should be based on nitrogen and potassium. The three elements of nitrogen, potassium and phosphorus cooperate, and pay attention to the inclusion of other elements. In this way, it can be corresponding to the harvest of elegant landscape, excellent texture and long-lasting lawn.
Various fertilizers should analyzed and understood for their nutrient content, and nutrient salt index per unit of plant.
②Fertilizer application amount
The possibility of burning lawn leaves and the physiological nature of fertilizers. Urea formaldehyde, organic nitrogen fertilizer, calcium superphosphate, heavy calcium superphosphate, potassium sulfate fertilizer per unit of plant nutrient salt index is low (≤ 1.0), the possibility of burned leaves is small. Conversely, sodium nitrate, ammonium nitrate, ammonium sulfate, ammonium phosphate, potassium nitrate and other salt index is high (≥ 2.5), the possibility of burned leaves. Spreading or spraying these fertilizers strive to achieve the right amount and uniformity, to avoid excessive amounts or concentration is too large. The rest, vegetation, diammonium phosphate, potassium chloride and other intermediate (l.0-2.5) may also burn the leaves.
First of all, according to the physiological nature of fertilizers, ammonium nitrate and other physiological alkaline fertilizers after plant absorption. Application should be careful to avoid deepening the acidification or alkalization of the soil, but use it to improve the soil pH.
D. Technical points of fertilization
(1) According to the characteristics of lawn fertilizer fasting
In practice, it can adjusted appropriately according to the lawn’s growth and season. Lawn leaves are green and soft, indicating adequate nitrogen fertilizer, straight and flexible, indicating rich in potassium and phosphorus. The amount of nitrogen fertilizer can increased for greening. In order to improve the overwintering and summer resistance of the lawn, the amount of potassium and phosphorus can be increased.
(2) Apply organic fertilizer at least once a year
In combination with soil leveling lawn ground, if special needs can be 2-4 times / year. The amount of organic fertilizer applied accounts for about 1/2 of the annual amount of nitrogen applied. The average green lawn can fertilized twice a year. The first time can be after the greening and the second time in autumn, the specific time depends on the climate and the state of nitrogen nutrition of the lawn.
(3) Temperature stability
After favorable lawn growth, the lawn’s nitrogen level allows the situation to grasp the application. The nitrogen level of the lawn can judged by borrowing the crop leaf color colorimetric card. In practice, the “1 and 3 leaf colorimetric method” is more practical, especially for diagnosing the nitrogen level of grasses. First of all, the unspread or not fully spread leaves of grass stems or branch ends are coded as No. 0. Secondly, the first fully expanded and fixed leaves are numbered as 1. In addition, the second leaf is coded as No. 2 and finally the third leaf is coded as No. 3.
(4) Sprinkler system of lawn
For example, you can dissolve the fertilizer in a small amount of water first, remove the residue and pour it into the sink. It becomes a 0.1%-0.2% water solution to spray on the lawn, which is uniform and saves effort.
(5) If the lawn of the sprinkler system
The first application should spread evenly and operated after the dew has dried. In order to avoid burning the lawn and to ensure the uniformity of grass color and height. Next, divide the fertilizer into two parts, one in the north-south direction and one in the east-west direction. Choose to do this before rain or water after spreading to allow the fertilizer to dissolve and penetrate into the soil.