Method for detecting ammonia volatilization in soil urea of dry direct seeding soil and influence on seed germination

Abstract

The invention discloses a method for detecting ammonia volatilization in soil urea of dry direct seeding soil and influence on seed germination. The method comprises the following steps: a, detecting ammonia volatilization in soil: sampling deep surface soil from a field block, sampling and naturally airing the soil and mixing to be uniform; b, adopting two culture dishes for a test and adding aired soil and urea to the culture dishes; c, placing a small culture dish in the center of the culture dish, adding a boric acid solution and a mixture indicator inside and covering the culture dishes with covers as an adsorption device; d, putting the device into an incubator to culture, wherein after ammonia is absorbed, the solution turns green; titrating by using hydrochloric acid, wherein the ammonia volatilization amount is calculated according to the volume of consumed hydrochloric acid; e, detecting influence of ammonia volatilization on seed germination: putting a rice seed on filter paper, putting a sealing device into the incubator to culture and then carrying out statistics. The method is feasible and simple and convenient to operate, so that mechanical dry direct seeding full stands of rice are ensured, thereby overcoming the bottleneck restraining large-area popularization of dry direct seeding rice, stabilizing the rice planting area and guaranteeing the national food security.

Description

Technical field [0001] The invention belongs to the technical field of high-yield and high-efficiency cultivation of rice, and more specifically relates to a method for detecting the volatilization of urea and ammonia from soil in dry direct sowing rice and its effect on seed germination, and is particularly suitable for screening suitable dry sowing rice varieties, soil types, nitrogen fertilizer forms, and nitrogen application Fertilization methods, and explore the best nitrogen fertilizer management plan for dry direct-seeded rice seedlings. Background technique [0002] At present, the severe shortage of rural labor force is one of the important limiting factors for my country's agricultural development. The key to solving this problem lies in the mechanization of agricultural production. For rice production, planting and harvesting are the two most labor-intensive links. At present, my country has basically achieved mechanization in the rice harvesting process, and the degr...

AI Technical Summary

Problems solved by technology

Urea must be hydrolyzed by soil urease before it can be absorbed and utilized by crops. However, when the activity of soil urease is too strong and the hydrolysis of urea is too fast, the crops will be poisoned due to the increase of local ammonia concentration.

Therefore, in the dry direct seeding system of rice, the application of urea as base fertilizer may adversely affect the germination of seeds and the early development of seedlings, becoming one of the bottleneck factors restricting the development of direct direct seeding rice.

Images