The Research Of Mother Fern Kept Method And Nitrogen And Potassium Fertilizer Used Of Asparagus Cultured In Plastic Greenhouse

Facing the problem of asparagus plant growing weaker and insufficient rhizosphere nutrition after long season cultivation under facility cultivation conditions, This experiment conducted keeping mother stalk optimization experiment and different rate of nitrogen and potassium fertilizer experiment bolt the appropriate time and number of mother stalk in plastic greenhouse and the appropriate rate of nitrogen and potassium for annual production of greenhouse asparagus. The purpose is to improve the efficient cultivation techniques in asparagus. The results were as follows:1. Appropriate Mother stalk culture helped improve the yield of asparagus in the plastic greenhouse, harvesting with 3 mother stalks at beginning and harvesting with 6 mother stalk three weeks after beginning, these two treatments were 67.80% and 93.40% higher than the treat of harvest without mother stalk respectively. Except the treat of harvesting with 6 mother stalk three weeks after beginning, Other Mother Stalk Culture treats promoted the number of harvested spears and vitamin C content in spears significantly, Given the mother stem number, as the time delayed, the nitrate content in spear reduced. Appropriate Mother Stalk Culture facilitated the photosynthetic pigment content of cladophyll and bulbel number in the crown, and harvest with 3 mother stalk, had higher photosynthetic pigment content than 6 mother stalks keeping treat at the same period. Given the mother stalk numbers, the earlier mother stalk kept the larger SPS activity in cladophyll, and the larger SS activity in storage root. The storage root total sugar content of harvest with mother stalk treatment, except harvesting with 6 mother stalk 6 weeks after began, were higher than harvest without mother stalk, the sugar content of harvesting with 3 mother stalks, were higher than harvesting with 6 mother stalks in the same time. Given the mother stalk numbers, the later kept mother stalk, the lower total sugar content in the root, while, bulbel number rose after reduced, while the treat of keeping mother stalk 3 weeks after began had the most. Considering the performance of yield, quality and plant growth and physiology, harvesting with 3 stalks at beginning was the best.2. Appropriate rate of nitrogen and potassium application promoted the increase of spear number and yield and quality of asparagus. With the increase of nitrogen application rate, the yield showed no significance; with the increment of potassium application rate, the yield was reduced after increased first. There was no significant interaction effect between nitrogen and potassium. The asparagus production was more sensitive to potassium fertilizer; With the increase of nitrogen application rate, the nitrogen content in spear increased first and then declined; with the increase of potassium application rate, the nitrogen sugar content sugar in spear increased first and then declined, while the K1, with potassium oxide10 kg per 667m2, had the most. Through regression analysis, it was concluded that the best fertilization decision-making: Under the circumstance of this experiment, using the fertilizer rate for 12.67 kg nitrogen, 7.74 kg potassium, yielded high.