Over the years, due to some misunderstandings in the summer corn planting methods, corn yield has been stagnant. In recent years, the author has conducted a large number of experimental studies, which proves that changing the summer corn planting method is the key to promoting the increase of yield and income of summer maize. The following "five changes" measures. 1. The late seeding and the lack of direct light resource for wheat fields are the limiting factors for the high yield of late-maturing corn in summer corn. Intercropping with wheat can increase the accumulated temperature around 300°C, which is an effective way to solve this contradiction. According to multiple experimental investigations The middle and late-maturing corn varieties intercropping increased 66.5-82.9 kg of corn from 667 square meters of live air, which increased production by 13.3% to 16.7%. Due to the influence of old planting habits, most farmers tend to plant corn in a live broadcast manner after harvesting wheat, and the annual maize planting area only accounts for 20% to 30% of the total area, resulting in low yield and poor quality, especially in the case of The adverse climate conditions such as buds, autumn drought, and late low temperature will also cause severe reductions in yields. Therefore, late sowing should be changed to intercropping. For wheat that cannot be interplanted, wheat is mixed with irrigated wheat yellow water and rans 10 to 15 days in advance to ensure high yield and stable yield of corn. 2. Change single fertilization to formula fertilization for a long time. Farmers in the fertilizer application of nitrogen fertilizer on the habit of nitrogen fertilizer, ignoring the role of nitrogen, phosphorus and potassium and trace fertilizer, resulting in a single nutrient, the effect of increasing production is not satisfactory, a number of test results show that, in the same applies to nitrogen fertilizer, per 667 square meters 25 kg, 50 kg, and 75 kg of phosphate fertilizer were added, and 1.90 kg of corn, 1.72 kg, and 1.45 kg of corn were produced for each kg of phosphate fertilizer; 10 kg, 20 kg, and 30 kg of potassium sulfate were added for every 667 square meters, and the production of potassium sulfate was increased per kg of potassium sulfate. 4.85 kg, 3.46 kg, 2.26 kg of corn, 0.5 kg, 1 kg, 2 kg, and 4 kg of zinc sulfate per kg of 667 square meters respectively increased the yield of corn by 105.8 kg, 68.6 kg, 30.2 kg and 38.5 kg, respectively. The principle of “enhance nitrogen, increase phosphorus, increase potassium, and increase zinc†respectively. Requirements of 667 square meters of standard nitrogen fertilizer 50 kg, standard phosphate fertilizer 40 to 50 kg, potassium sulfate 10-15 kg, zinc sulfate 1 to 2 kg, the test results show that this method of fertilization than a single nitrogen production increased by 24.8% to 35.2%. 3. Concentrated application of nitrogen fertilizer for staged fertilization For many years, farmers used to perform nitrogenous fertilization with concentrated fertilization during the big bell-mouth period. This fertilization method is not conducive to the interplanting corn seedlings, but also can not meet the fertilizer needs of the high-yielding fields. According to the needs of the nitrogen fertilizer in different growth stages of the maize and the different requirements of the sowing method, the following nitrogen fertilizer application program is proposed: High-yielding fields adopt the “three attack†top-dressing method. When the leaf age index is 30%, nitrogen fertilizer stalks with a total fertilization amount of about 30% are applied. When the leaf age index is 60%, 60% of nitrogen fertilizers are applied to attack and the rest 10 % applies seed attack during grain filling. Generally divided into two fields, respectively, in the leaf age index 30% and 60%. Interplanting corn is light and heavy, with 60% being applied for the first time and 40% being applied the second time. Before light corn, light and heavy. The experimental results showed that the application of nitrogenous fertilizer in stages was 9.9%-12.1% higher than that of “one-shelled bombardmentâ€. 4. Relax to add mid-to-late management. The middle and late period of corn production is the key period for the formation of crop yields. Production is often reduced due to drought, defertilization, premature aging, and spider mite damage. Therefore, measures should be taken to strengthen the management in the medium term. The first is to supplement land with a tendency to defertilize. Seed-seeding fertilizer, preventing premature aging and increasing grain weight, and secondly, watering in case of drought to keep field water holding capacity above 80%. Third, use 0.2% aovecide cream oil 2500 times or 1.8% Insecticide grams of emulsifiable concentrate 3000 times continuous application of 2 to 3 times, the eradication of its occurrence in the spot. 5. Change early harvest to timely and late harvest When farmers harvest corn, there is a widespread phenomenon of early harvest, generally about 40 days after pollination, and when the yellow leaves are harvested, the grouting has not ended yet. Affect production. According to the results of multi-species and multi-point experiments, the milk content of maize kernels was shifted down by 1/2. At this time, the temporal lobe had just turned yellow and the average grain weight was 324.7 g. The corn kernel milk line basically disappeared. At this time, the loquat leaf was loose and white, and the weight of one thousand grains was average. 357.2 g. From the milk line down 1/2 to the disappearance of the milk line, it took 10 days to increase grain weight by 31.5 grams and increase production by 10%. Therefore, the harvest of corn should be basically disappeared when the grain milk line is lost, and the temporal lobe becomes white and dry. To sum up, as long as we pay attention to changing the old planting habits and cultivate the correct planting habits, we can achieve the purpose of increasing production and income.
Sorfa centrifuge tubes are applicable in molecular biology as disposable laboratory consumables which are manufactured from high transparency polypropylene. Three types of volume are available to meet general need: 15 ml, 50 ml and 200 ml. A ring molded on inner surface of cap make an excellent seal to prevent leak of liquid. Marking area is printed in white to make tube easy for identification. Clearly graduation in black on the surface is helpful for users to calibrate. Preferably, 3 ml graduation molded on conical bottom improves the accuracy of centrifuge tube.
The range of temperature tube can bear is from -80°C to 120°C. In the centrifuge machine, tube spins in the speed of 20,000 r/min. Maximum RCF( Reactive Centrifugal Force) is 12,000 g. All Sorfa centrifuge tubes are packaged in bags or racks with sterilization, RNase-free, DNase-free and Non-pyrogenic.
Product feature:
1. Three types of volume 15ml, 50ml and 200ml
2. Conical bottom and self-standing bottom
3. Maximum RCF12,000 xg
4. Two types of irradiation Gamma and E.O.
5.Temperature range -80°Cto120°C
6. RNase-free, DNase-free and Non-pyrogenic
Packaging information
Lot number is printed on packaging for tracking
Heat-sealed bag, reusable zip bag, foam rack, PS rack
Cartons are customized for protecting products from damage.
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Cat NO.
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Volume ml
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Description
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sterile
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packaging
|
|
T121-1
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15
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Conical bottom.blue screw cap
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No
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Heat-sealed bag.bulk pack, 1000pcs/Ctn
|
|
T121-2
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15
|
Conical bottom.green screw cap.anti-Gamma material
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Gamma
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Reusable zip bag.100pcs/bag.1000pcs/Ctn
|
|
T121-3
|
15
|
Conical bottom.blue screw cap
|
E.O.
|
Heat-sealed bag.50 pcs/bag.1000 pcs/Ctn
|
|
T121-4
|
15
|
Conical bottom.green screw cap.anti-Gamma material
|
Gamma
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PS rack.50pcs/rack.1000 pcs/Ctn
|
|
T121-5
|
15
|
Conical bottom.blue screw cap
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E.O.
|
foam rack.50pcs/rack.1000 pcs/Ctn
|
|
T124-1
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50
|
Conical bottom.blue screw cap
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No
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Heat-sealed bag.bulk pack.500 pcs/Ctn
|
|
T124-2
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50
|
Conical bottom.green screw cap.anti-Gamma material
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Gamma
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Reusable zip bag.50 pcs/bag.500 pcs/Ctn
|
|
T124-3
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50
|
Conical bottom.blue screw cap
|
E.O.
|
Heat-sealed bag.25 pcs/bag.500 pcs/Ctn
|
|
T124-4
|
50
|
Conical bottom.green screw cap.anti-Gamma material
|
Gamma
|
PS rack.25 pcs/bag.500 pcs/Ctn
|
|
T124-5
|
50
|
Conical bottom.blue screw cap
|
E.O.
|
foam rack.25 pcs/bag.500 pcs/Ctn
|
|
T125-1
|
50
|
Self-standing bottom.blue screw cap
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?
|
Heat-sealed bag.bulk pack.500 pcs/Ctn
|
|
T125-2
|
50
|
Self-standing bottom.blue screw cap
|
E.O.
|
Heat-sealed bag.25 pcs/bag.500 pcs/Ctn
|
|
T126
|
200
|
Conical bottom.blue screw cap
|
?
|
Heat-sealed bag.6 pcs/bag.96 pcs/Ctn
|
|
T127
|
15
|
15ml centrifuge tube PS rack
|
|
Heat-sealed bag.1pcs/bag
|
|
T128
|
50
|
50ml centrifuge tube PS rack
|
|
Heat-sealed bag.1pcs/bag
|
Centrifuge Tube
Capillary Tube,Plain Tube,Centrifuge Tube
Zhejiang Sorfa Medical Plastic Co., Ltd. (Ningbo Jiangdong Aron Imp&Exp. Co.LTD) , http://www.sorfapipettes.com