The difference between grass seedlings and barnyard grass, is barnyard grass a straight root system or a fibrous root system?

The leaves and veins of the seedlings are green and rough, with two

The difference between grass seedlings and barnyard grass, is barnyard grass a straight root system or a fibrous root system?

The leaves and veins of the seedlings are green and rough, with two spikes with sickle-shaped stems. Barnyardgrass has no tongue and ears, and its leaves are green and darker than rice. In paddy field, rice and barnyard grass are not the same species, they are interspecific competition. When weeding rice fields, we must pay attention to the management of water and fertilizer in the fields. If we treat herbicides with stems and leaves, we must drain water first and then apply pesticides.

First, the difference between grass seedlings and barnyard grass

1. The leaves and veins of seedlings are generally green and rough. There are two hairy auricles, the stem is sickle-shaped, the tongue is sword-shaped, and there are some fine hairs on the auricle joints. Barnyardgrass has no tongue and ears, and its leaves are mainly green, darker than rice, and its veins are white and smooth.

2. In paddy field, rice and barnyard grass do not belong to the same species, but belong to the competition of interspecific relationship, that is, the aboveground part competes for sunlight, and the underground part competes for water and inorganic salts. Rice and barnyard grass will also compete for living space and nutrients. Barnyard grass will directly affect the growth of rice, because the more barnyard grass, the weaker the growth of rice, on the contrary, the less barnyard grass, the better the growth of rice.

3. When weeding rice fields, we must pay attention to the management of water and fertilizer in the fields. When using stems and leaves to treat herbicides, it is necessary to drain water before applying herbicides. After applying herbicide, it must be rehydrated for about 5-7 days, otherwise the efficacy will be reduced. Don't topdressing immediately after taking the medicine, which will lead to weeds turning green and affect the efficacy. The 2-4 leaf stage of barnyard grass is the best control period. In the meantime, we must seize the opportunity to apply pesticides. If the best opportunity is missed, the efficacy will be greatly reduced.

2. Is barnyard grass a straight root system or a fibrous root system?

1, barnyard grass is a direct root system. The plant characteristics of the taproot system are that the taproot is obviously developed, the growth direction of the root is vertical downward, the lateral roots are mainly distributed around the taproot, and the lateral roots are grape-shaped. Barnyard grass belongs to the genus Panicum, also known as barnyard grass, paddy grass, barnyard grass, etc. It is distributed all over the country and mainly harms crops such as rice, wheat, corn, millet, soybean, vegetables and fruit trees.

2. Herbicides such as bentazone, bispyribac-sodium, Dichloraz, cyhalofop-butyl and penoxsulam can be used to kill barnyard grass in rice fields. Attention should be paid to the use of chemicals, and different methods of using chemicals are different. When spraying, an atomizing sprayer must be used. Don't spray it repeatedly after spraying, and turn it off in shallow water after 30 hours, the efficacy will be stronger.

It must be noted that drugs must be selected according to the local climate and topography. For example, acetochlor cannot be used in cold areas in the north, and drugs such as butachlor and oxyfluorfen cannot be used in uneven areas. The dosage of the drug must be prepared according to the instructions for use, and it cannot be used excessively. Most farmers think that it is necessary to increase the dosage in order to control weeds. If the dosage is increased by 2-3 times, the seedlings will not take root for a long time. Especially in low temperature years, if the seedlings don't take root and turn yellow, there will be a large area of dead seedlings, so be sure to use the medicine according to the instructions.