In the three stages of corn growth, the proportion of fertilizer needed is different. The seedling stage accounts for 2% of total fertilizer, the ear stage accounts for 85%, and the grain stage accounts for 13%. From the jointing to the big glutinous period, the corn is the peak period of fertilizer demand. When fertilizing, it is reasonable to fertilize, that is, the combination of bottom fertilizer, seed fertilizer and topdressing; nitrogen fertilizer, phosphate fertilizer and potassium fertilizer combination; agricultural fertilizer, chemical fertilizer and biological fertilizer combination. The base fertilizer should be applied. This is the basis. Generally, 2000 kg of organic fertilizer is applied to the mu, 7.5 kg of phosphorus pentoxide, and 5.5 kg of potassium fertilizer is used as the base fertilizer.
In the bottom fertilizer, the level of seed fertilizer application is not high, the soil fertility conditions are poor, and the plots of late-maturing varieties can be planted in the 6-7 leaf stage of corn, and the topdressing of urea is about 15 kg, deep chasing 15 cm or more, and improving fertilizer. Utilization rate; the base fertilizer and the fertilizer are applied to the land with high level, and the urea is about 10 kg.
Corn topdressing should be carried out as soon as possible. The first method is to topdress the top, the back is squatting, the topdressing and the hoeing are combined; the second is to use the hoeing pit to deepen the 15 cm or more; when topdressing, the combination of chemical fertilizer and biological fertilizer is needed to promote the good root system. Development, under normal circumstances, the acres of urea 10 to 15 kg, plus 1 kg of biological fertilizer, can promote early maturity of corn.
During the filling stage of the heading stage, 0.25 kg of potassium dihydrogen phosphate and 0.5 kg of urea are used, and 50 kg of water is applied to the foliar spray to prevent baldness and lack of grain, increase yield and improve quality. Organic food corn, can not use fertilizer, it is best to use fermented organic fertilizer, base fertilizer, topdressing fertilizer, fertilizer effect is stable and lasting, the effect is better than chemical fertilizer, and the stamina is long, but when topdressing, cake fertilizer and crop seedlings maintain an appropriate distance, so as not to avoid The heat generated by the fermentation of the cake fertilizer burns the seedlings.
Author: Zhang Hongfen
Source: Douyu Town, Rucheng County, Hebei Province
Rebar Thread Rolling Machine is one of our main products. The more detail information as follow:
Machine Function
It is mainly applied to peel rebar rib first, then roll parallel thread on rebar end, after that, two threaded rebar sectors could be connected by coupler.
It is a necessary machine for rebar joint. In addition, it is also applied to roll threads on round steel bar, anchor rod, or other equivalent materials.
Machine Advantages
1. Both right-handed threads & left-handed threads could be processed with one machine head.
2. Simple operation, reducing workers' labor intensity.
3. Shortening construction period.High processing speed and production Efficiency.
Machine Parameters
|
Model |
Rebar Diamete |
Max Thread Length |
Thread Angle |
Thread Pitch (mm) |
Electrics |
|
JBG-40K |
14-40mm |
65mm |
60°/75° |
2.5; 3.0; 3.5 |
380V/50Hz |
|
JBG-40KI |
14-40mm |
65mm |
60°/75° |
2.5; 3.0; 3.5 |
380V/50Hz |
|
JBG-40T |
14-40mm |
100mm |
60°/75° |
2.5; 3.0; 3.5 |
380V/50Hz |
|
JBG-40F |
16-40mm | 300mm |
60°/75° |
2.5; 3.0; 3.5 |
380V/50Hz |
|
JBG-50 |
12-50mm | 100mm |
60°/75° |
1.75; 2.5; 3.0; 3.5 |
380V/50Hz |
Product Features
1. It uses large machine rack which makes machine more stable.
2. It adopts famous brand reducer and motor, the machine performance is superior.
3. All the main parts need to be tested, the quality is better, the service lift is longer.
4. The thread precision is high, the conical degree is small, and the thread surface is smooth.
5. The machine is easy to operate.
Rebar Thread Rolling Machine
Portable Rebar Threader,Rebar Threader For Construction,Metal Steel Thread Rolling Machine,Nail Thread Rolling Machine
BAODING JINDI MACHINERY CO., LTD , http://www.rebarconnector.com