How to choose soil nutrient speedometer

Agricultural development has always been a key point in China. In order to develop agriculture scientifically and healthily, agricultural technology promotion centers are vigorously promoting soil testing formulas, so soil nutrient analyzers are applied. In the past two years, the soil testing formula has achieved good results, the application is more popular, and the market demand for soil nutrient speed measuring instruments is also larger. Nowadays, there are many brands of soil nutrient rapid measuring instruments on the market. Many people do not know how to purchase soil nutrient speed measuring instruments because they do not have experience in using soil nutrient speed measuring instruments. Here are some suggestions.

1. Select a product with a measuring instrument prototype and a device manufacturing license. The state has strict management of the production of measuring instruments. The soil nutrient speed measuring instrument belongs to the measuring instrument and must be tested by the metrological product supervision and inspection department. On the basis of the reliability of the inspection, the technical supervision department shall also assess the production conditions of the production facilities, personnel technical level, technical documents, verification conditions, management system, etc., and the deadline for non-compliance. Rectification; after rectification, it can pass the assessment and issue a manufacturing license for measuring instruments. These two certificates are the basic guarantee for product quality. Uncertified products or products with incomplete certificates are illegal products and illegal products. It is very dangerous to purchase such products.

2. It is necessary to check the stability of the soil fertilizer detector. When purchasing the instrument, in addition to understanding the performance indicators through the publicity materials, the key points should be to check the stability of the instrument. The inspection method is:

(1) Turn on the power and warm up the instrument for 5-10 minutes.

(2) Cover the instrument with a light-shielding cover, adjust the instrument to make the display read zero, observe the change of the instrument reading, and divide the difference between the maximum and minimum readings of the instrument within 3 minutes by the full-scale reading, which is the stability error of the instrument. As the saying goes, the instrument is not afraid of being unsure, and the instrument with unsatisfactory stability cannot be used.

3 Select the soil nutrient speed tester with complete basic test items. The soil nutrient speed tester can have many test items, but you should pay attention to the need to meet the requirements of the basic test of soil testing and fertilization. These basic projects are available nitrogen (where all nitrogen is used), available phosphorus, available potassium and organic matter. Available nitrogen includes available nitrogen, ammonia nitrogen, nitrate nitrogen) and easily hydrolyzed organic nitrogen. At present, there are many measuring ranges of domestic soil fertility instruments that have not yet met the requirements of these basic project tests. Some of them cannot measure the organic matter of nitrate nitrogen, and some of them cannot be alkaline nitrogen (or total nitrogen). This does not guide the fertilization very well. Whether the basic test items of the soil and fertilizer meter are complete can be known by looking at its promotional materials or instructions.

Vacuum Sweet Corn Kernels

For the most common waxy and sweet corn on the market, waxy corn has a higher nutrient content than regular corn, containing 70-75% starch (and almost all straight-chain starch), more than 10% protein, 4-5% fat and 2% multivitamins, with more grains, VA, VB1 and VB2 in protein than rice, with the highest fat and VB2 content. Yellow maize also contains carotenoids, such as rice and wheat. The molecular weight of waxy maize starch is more than 10 times smaller than that of ordinary maize, and the starch makes glutinous rice sticky and soft, softer than ordinary hard maize. It is more than 20% more digestible to eat than regular maize and it is suitable for people with less than perfect teeth. At the same time, it is not suitable for diabetics because of the very high content of straight-chain starch (a polysaccharide).