Planting technique of 45 cm narrow row dense planting of soybean

The 45 cm narrow row dense planting cultivation technique of soybean is a new technology selected according to the climate, soil and cultivation characteristics of our region on the basis of the narrow row dense planting technology of soybean introduced from Heilongjiang in 2004 in Dunhua City. it is a new breakthrough in the reform of farming system in Dunhua City. Experiments were carried out on Guandi, Heishi and Shaheyan farms in 2005. the average yield of soybean in the experimental area was 202.9 kg per mu, an increase of 24.9% over the control. in 2006, the whole city popularized 1500 mu, with an average yield of 203.52 kg per mu, and the highest yield per mu reached 247.78 kg, an increase of 34.9% over the control. this has explored a new technical way for soybean production to a new level.

I. the principle of increasing yield of narrow row and close planting of soybean

Narrow row close planting due to narrowing the line spacing. The plant distance was enlarged, the plant distribution was more uniform and reasonable, the green area was increased, and the light condition was improved, especially in the middle and lower layers. Due to the reasonable distribution of plants, the light-receiving area of leaves and the utilization rate of light were increased, thus the dry matter weight was increased and the high yield was ensured.

2. Technical measures for narrow row and close planting of soybean

1. Select suitable varieties: select varieties with short or semi-dwarf, limited or sub-limited stalk. Select the varieties that mature earlier than the local varieties. But it should not be premature, otherwise the accumulated temperature will be wasted and the yield will be affected. The varieties suitable for narrow row and close planting in Dunhua City are Kenjian 23, Hefeng 35, Heinong 35, Beifeng 11, Heihe 27, Hongfeng 11 and so on.

two。 Seed treatment: in order to control two-leaf beetle and root rot and control the damage of diseases and insect pests in continuous cropping, and to ensure that the whole seedling was strong, seed coating was carried out 5-7 days before sowing, mixed with 40 grams of 35% apron + 300 grams of 70% Ruisheng, and added 1.3 liters of water. Add 2.5% suspending seed coating agent 200ml mixed with 100kg seeds Or seed stand (35% more than Kefu) or Wei Dou Ke (35% more than Fogg suspension emulsion) 1 kg mixed with 70 kg 100 kg seeds.

3. Soil deep loose: narrow row close planting must have a good plough layer condition, to achieve deep plough layer, flat surface, fine soil. Narrow-row close planting requires that the soil must have a deep loose foundation, otherwise it can not increase production. The depth of rotary tillage is 15cm to 20cm, and farmers with large machinery had better reach more than 25cm.

4. Select sowing and fertilization machinery: GTX~2 (3) A2 general tillage machine is selected to complete ridging, fertilization, sowing, soil mulching, suppression and later ploughing operations. this machine is characterized by not only narrow row dense planting, but also common ridge distance planting of soybean.

5. Determine the appropriate density and specifications to ensure the sowing quality: all localities should take measures in accordance with local conditions and determine by themselves according to the actual local conditions. Double-row planting on the ridge, row spacing is 8 cm, single-row grain spacing is 10-12 cm. Generally, there are 2.32 ~ 26600 seedlings per mu. If it is determined that the number of harvested plants is 26600, sowing 30, 000 seeds per mu, the sowing rate is 6 kg / mu. The sowing depth is 3cm to 5cm below the compacted surface. Chemical fertilizer is applied to plant 5cm to 8cm. Fertilizer input should be increased and 20 kg / mu of ternary compound fertilizer should be applied on the basis of farm manure. Suppression width and intensity: the seedling belt suppression width is 24026cm, the suppression intensity is 650g / square centimeter.

6. Do a good job of chemical weeding: narrow rows of close planting restrict mechanical and manual weeding, so it is very important to do a good job of chemical weeding. Before sowing, soybeans use 48% trimethoprim 0.75% 1 liter per hectare, 80% Kuocaoqing 30 grams or 75% Baoshou 150020 grams + Jindu 1.35 liters (72% dur 2.3 liters or 90% Acetochlor 1.5 litres).

7. The application of chemical control technology and spraying foliar fertilizer and the combination of promotion and control: under the condition of vigorous growth in the early stage, if the soybean grows too much after entering the flowering stage, it will become an overgrown field, resulting in lodging, falling flowers and pods, and reducing yield. therefore, when the field plant growth is too prosperous, there is a danger of lodging, triiodobenzoic acid, paclobutrazol, harvest treasure and other chemicals can be sprayed to prevent lodging, increase flowers and pods, and increase yield. When soybean is short in the early stage and closes ridges late due to drought and other reasons, foliar topdressing should be carried out. Foliar fertilizer should be applied at the early flowering stage and podding stage of soybean. Urea 5 kg 10 kg plus potassium dihydrogen phosphate 3 kg and water 400 kg 500 kg can be sprayed.

Matters needing attention

1. There must be a deep loose foundation.

two。 According to the local actual situation, we can adopt different line spacing according to local conditions. Generally, the average single broadcast can be about 15cm to 20cm.

3. There must be better herbicide application technology. It is not suitable to use this technique in plots with more weeds.

4. Under different soil conditions, the density should be different, and the number of harvested plants per hectare should be controlled at 40 ~ 450000.

5. Be sure to spray secondary foliar fertilizer in the later stage.