Onions belong to the green body vernalization crops. After the plants have a certain size through vernalization, they can twitch and branch under warm conditions and certain sunshine conditions. In recent years, onions in Fengxian County and other places often undergo pre-convulsions and branching, mainly due to early sowing, large seedlings, or large amounts of growth before winter after planting. Seedlings are caused by vernalization during overwintering, and genetic traits and climate of the varieties. The factors and the soil environment also have a certain relationship, and production should be prevented by adopting measures such as rational selection of varieties, appropriate sowing, and strengthening of winter and spring field management.
Variety selection is resistant to bolting, strong winter, suitable for planting in North Jiangsu, early maturing varieties include Japanese Brocade, medium-early-maturing varieties such as Golden Grand Onion, medium-maturing varieties including Quanzhou Zhongjia Gaohuang and late-maturing varieties including OP Huang and Zhen. Magnitude.
Colonization in the appropriate period in early November, seedling age 50 to 60 days when planting, pay attention to remove weak seedlings and Wang Miao.
To strengthen the general lack of nitrogen fertilizer field management, soil drought, weak onion growth prone to early bolting and branching phenomenon, it is necessary to strengthen the management of winter and spring to promote plant growth and robust. Pour well over winter water before winter so that the young plants can grow 1 to 2 new leaves for winter. Watering in a timely manner after spring starts, timely application of fertilizers in weak seedlings to promote vegetative growth. Pour the first water in early March, combine watering and fertilization, and promote the plants to return to green hair trees. In the first half of April, the second part of the water will be poured in the vigorous growth stage of the leaves; the third time of bulb expansion will be watered and fertilized in the beginning; Watering, keeping the soil wet and dry, promoting the bulb to continue to grow, to inhibit flower bud differentiation. Require reasonable allocation of fertilizer, not partial nitrogen fertilizer, based on the application of base fertilizer, apply urea 7 ~ 8 kg per mu, potassium sulfate 5 ~ 7 kg. In the field, if the plants are convulsed and branched in advance, they must remove the weak branches in time so as to promote the growth and development of the plants and ensure normal expansion of the bulbs.
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Specification:
|
Product Model: |
JX40 |
|
Accuracy: |
±1.5mm (0.06 inch) |
|
Measuring Unit: |
metre/inch/feet |
|
Measuring Range: |
0.03~40m (0.01 to 131 ft) |
|
Measuring Time: |
0.1~4 seconds |
|
Laser Class: |
Class II |
|
Laser Type: |
635nm, <1mW |
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Waterproof & Dustproof : |
IP54 |
|
Auto Laser Off: |
60 seconds |
|
Automatic Power-off: |
480 seconds(8 minutes) |
|
Lighting: |
white LED |
|
Datum Option: |
Can choose Front edge or end piece edge as datum |
|
Battery Status: |
Y |
|
Signal Strength Display: |
Y |
|
LCD display: |
2 inch large screen |
|
Display illumination and multi-line display: |
Max 2 displays |
|
Data Memory: |
Y (allow 20 values) |
|
Backlight display: |
Y |
|
Continuous Measurement: |
Y |
|
Min/max Measurement: |
Y |
|
Addition/Subtraction(Distance/Area/Volume): |
Y |
|
Area/Volume/Pythagoras Measurement: |
Y |
|
Battery Type: |
AAA alkaline battery(2*1.5v ) |
|
Weight: |
about 80g |
|
Dimensions(L*W*H): |
4*2*11.5cm |
|
Auto correction and error report technology: |
Y |
|
Operating Temperature: |
0-40 ℃(32-104 ℉ ) |
|
Storage Temperature: |
-20~60 ℃ (-4~140 ℉) |
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Chengdu JRT Meter Technology Co., Ltd , https://www.jrt-measure.com