Symptom Identification and Control Methods for White Rust of Rapeseed
Identification and Control of White Rust of Rapeseed
For sowing or raising seedlings, double-film watermelons can be directly sown or raised as seedlings. For direct sowing, sow 35 to 40 days before the last frost. For small-tunnel watermelons, early-maturing varieties are used; prepare melon trenches about 50 cm wide and 25 to 35 cm deep in the beds at a row spacing of 1.4 to 1.8 m, apply high-quality fine fertilizer in layers in the trenches, mix the fertilizer and soil evenly, fill the trenches level, and pat firm.
For planting and management, apply 5000 to 6000 kg of high-quality farm manure per plot, 40 to 50 kg of superphosphate or compound fertilizer, at least 10 kg of urea, and 60 to 100 kg of watermelon special fertilizer or cake fertilizer. Apply 1/3 to 1/2 of the organic fertilizer and phosphate fertilizer broadcast, apply the remaining fertilizer and 1/3 of the nitrogen fertilizer in trenches, and 2/3 of the nitrogen fertilizer can be used as topdressing.
For branch pressing, vine training, and fruit protection, early-maturing watermelons mostly use single-vine pruning, leaving only the main vine; some also leave one side branch at 30 cm from the base of the main vine to increase leaf area. Select the 2nd or 3rd female flower on the main vine to set fruit. For second-crop double-film watermelons, maturity is early; the first watermelon is harvested around mid-July, and after harvest, if there are still more than 60 days before the local frost and conditions are suitable for watermelon growth, and the watermelon plants have no.
For planting and management, apply 5000 to 6000 kg of high-quality farm manure per plot, 40 to 50 kg of superphosphate or compound fertilizer, at least 10 kg of urea, and 60 to 100 kg of watermelon special fertilizer or cake fertilizer. Apply 1/3 to 1/2 of the organic fertilizer and phosphate fertilizer broadcast, apply the remaining fertilizer and 1/3 of the nitrogen fertilizer in trenches, and 2/3 of the nitrogen fertilizer can be used as topdressing.
For branch pressing, vine training, and fruit protection, early-maturing watermelons mostly use single-vine pruning, leaving only the main vine; some also leave one side branch at 30 cm from the base of the main vine to increase leaf area. Select the 2nd or 3rd female flower on the main vine to set fruit. For second-crop double-film watermelons, maturity is early; the first watermelon is harvested around mid-July, and after harvest, if there are still more than 60 days before the local frost and conditions are suitable for watermelon growth, and the watermelon plants have no.