The main technical content: (I) Soil sample collection Soil sample collection depth is 20cm, the representative area is generally not more than 50 acres, mainly in serpentine or zigzag shape, the first 2-3cm surface soil scraped off the sampling, collecting depth 20cm, width 10cm, 1-2cm after the soil The sampler should be inserted perpendicular to the ground to a depth of 20cm. The collected soil sample should be crushed. Mixtures of gravel and animal and plant residues should be picked up. Mix thoroughly and weigh in quarters to 0.5kg. Inside the bag, there must be a label inside and outside the tape. Mark the sample number, the name of the sampling site, the date of sampling, and the sampler. (two) soil sample test 1. Determination of alkaline nitrogen in soil: At a certain temperature, the hydrolyzable nitrogen in the soil is hydrolyzed into ammonium nitrogen, together with the original ammonium nitrogen in the soil, and escapes in the state of nitrogen, using filter paper impregnated with acid. The block was absorbed and then measured by Nessler's reagent colorimetry. 2. Determination of Soil Available Phosphorus: After the available phosphorus in soil is leached, it is usually measured by the molybdenum blue colorimetric method. At a certain concentration of acidity and other reagents, phosphate and ammonium molybdate generate phosphomolybdic acid, which is reduced. Blue complex phosphorus molybdate blue, blue and phosphorus concentration is proportional to. 0.5M NaHCO3 can inhibit the activity of Ca2+, so that the more active Ca-P is leached, and the more active Fe-P and Al-P can be leached by hydrolysis. 3. At pH 5-10, potassium ions react with sodium tetraphenylboron to form a stable precipitate of potassium tetraphenylborate, which makes the solution cloudy. In a certain concentration range, turbidity is directly proportional to the concentration of potassium. Garlic.Ginger.onion.peeled Onion.peeled Garlic.frozen Onion Pieces garlic.Ginger.onion.peeled onion.peeled garlic.frozen onion pieces henan junzhian food co., ltd , https://www.junzhianfood-onion.com
We mainly export European Chinese onions, garlic and ginger.
Fresh yellow onion and red onion size 60-80mm 70-90mm 90-110mm 10kg/net bag, 20kg/net bag or 25kg/net bag (2019 new crop onion)
Peeled yellow onion and red onion size 60-80mm 70-90mm 90-110mm 10kg / box, 20kg / box, filled with nitrogen, storage time of 90 days.
Frozen onion, frozen onion cube, frozen onion ring 10kg/box or 20kg/box Save for 2 years.
We also offer garlic, ginger and peeled garlic
Our onions have been sold in the Netherlands, the UK, Poland, and Italy, and the quality is very good.
Looking forward to your response, I am very happy to quote you.
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Soil speed measurement technology