Study on dose absorptivity of Cotton to Dexamethasone

The characteristics of unlimited growth habits and great plasticity of plant type of cotton determine that it must be adjusted many times during its growth period, especially under the cultivation mode of "early, dense, dwarf and film". Through directional induction, we can shape the reasonable field structure and obtain the best time and space distribution of cotton bolls. this paper uses large-scale spraying machinery to take Xinluzao 23 as the object. The study on the absorption rate of thalidomide at different stages of cotton growth and development is as follows.

I. selection of spraying machinery

The traction power is between 30 and 65 horsepower, the volume of the spray tank is 1.7 to 2.2 cubic meters, the distance between the nozzles is 30 cm, the number of nozzles is 35, and the sprinkler is 70 cm from the ground in the working state. The working pressure is 1.5MP, 667 square meters, the water quantity is 40kg, the spray rack width is 1050 cm, and the spray width is 1150 m. Seven films can be sprayed at the same time, that is, two sowing frames plus one film, with a total of 28 sub-lines, with a width of 1050cm to 1056cm.

2. The absorption rate of metoprolol by cotton plants at different growth stages.

1. Seedling stage

At the third leaf stage, the plant height of ① is 1012cm, the plant width is 8cm, the plant height is larger than the plant width, and the dosage of Ketamine is 0.8g / 667m ~ 2.

The row spacing of 12 rows of small 3 film is 18 "50" 18 cm, and the sowing width is 450 "453 cm. The plant width is 3 cm 10 cm, the width of the two sub-rows is 16 cm 20 cm, the plant width within a spray amplitude is (16 cm 20) × 2 × 7 cm 224 cm 280 cm, the absorptivity is 224 cm 280 cm / 1150 cm, and the actual absorption rate is 19.48% × 24.35%. The actual absorption amount of metoprolol in cotton is 0.16 × 0.2g / 667m2.

The row spacing of machine cotton picking is 10 "66" 10 cm, the sowing width is 450 "453 cm, and the actual absorption rate is 19.48% 24.35% gamma. The actual absorption amount of cotton in 3-leaf period is the same as that of small 3-film 12 lines.

At the 6th leaf stage, the plant height of ② is 250.30cm, the plant width is 1520cm, the plant height is larger than the plant width, and the dosage of Ketamine is 1.51.8g / 667m2.

The width of two sub-rows in 12 rows of Xiao 3 film is 40cm 46cm, the plant width in one spray range is (44mm 46) × 2 × 7cm 560cm 644cm, the absorptivity is 560cm 644cm / 1150 cm, and the actual absorption rate is 48.69% 56.0%. The actual absorption amount of cotton is 0.73 × 0.84g / 667m and 0.8801g / 667m.

The width of two sub-rows of cotton harvested by machine is 30cm 35 cm, the plant width within one spray width is (30cm 35) × 2 × 7cm 420.490 cm, the absorption rate is 36.5% × 42.61%, and the actual absorption amount of cotton is 0.55 × 0.64 g / 667 square meters, 0.66 × 0.77 g / 667 square meters.

two。 Full bud stage (8-9 leaves)

The plant height is 40cm / 45cm, the plant width is 25cm / 30cm, the plant height is larger than the plant width, and the dosage of Ketamine is 2.5 × 3.0g / 667 m2.

The width of two sub-rows in 12 rows of ① small 3 film is 55cm 60cm, the plant width in one spray range is (5560cm) × 2 × 770cm 840cm, the absorption rate is 66.95% 73.04%, and the actual absorption amount of cotton is 1.67cm 1.83g / 667m and 2.01m 2.19g / 667m.

The width of two sub-rows of cotton harvested by ② machine is 50cm 55 cm, the plant width within one spray width is (50cm 55) × 2 × 700cm 770cm, the actual absorption rate is 60.87% 66.95%, and the actual absorption capacity of cotton is 1.52 × 1.67g / 667m, 1.83x 2.19g / 667m.

3. Flowering and boll stage (1213 leaves)

The plant height is 55 cm 60 cm, the plant width is 36 cm 40 cm, the plant height is larger than the plant width, and the dosage of ketamine is 3.5 × 4.0 g / 667 square meters.

The width of two sub-rows of ① small 3 film 12 rows is 70cm 75cm, the plant width within one spray amplitude is (70cm 75) × 2 × 780cm 1050cm, the absorption rate is 85.22% 91.30%, and the actual absorption amount of cotton is 2.983.2g / 667m and 3.41g / 667m 2.

The width of two rows of cotton harvested by ② machine is 65cm 70cm, the plant width within one spray width is (6570cm) × 2 × 710cm 980cm, the absorption rate is 79.13% / 85.22%, and the actual absorption amount of cotton is 2.77 × 2.93g / 667m2 and 3.1703.41g / 667m2 respectively.

4.。 After hitting the top

The plant height of Xiao 3 film 12 rows is 60cm / 65cm, the plant height of cotton harvested by machine is 70cm / 75cm, the dosage of propranolol is 1015g / 667 square meters, the size of the ridge is sealed, the actual absorption rate can reach 100%, and the actual absorption of cotton is 1015g / 667 square meters.

Third, the effect of other factors on the absorption rate of protamine in cotton plant.

1. Vehicle speed

The speed of the car directly affects the absorption rate of the cotton plant to metoprolol, and the absorption rate decreases when the speed is too fast, which can not achieve the purpose of chemical control. For the cotton field with normal growth, the normal speed can be used for chemical control, but for weak seedlings, the absorption rate is increased, which is equal to the increase of the dosage of metoprolol. In order to achieve the goal of "one height, one color", the speed of cotton field in Wangchang can be reduced to increase the absorption rate of propranolol.

two。 Working pressure of pump

General adjustment in 1.5MP, too big tube burst, too small will reduce the absorption rate of cotton plant to metoprolol.

3. Temperature

When the air temperature is high, the evaporation is fast, and the absorption rate of cotton plant to metoprolol is reduced. Chemical control operations should be carried out before 12:00 in the morning or after 17:00 in the afternoon.