Effect Of Nitrogen And Potassium On Biomass, Quality And Nutrient Absorption Of Radish In The Northwest Plateau Of Hebei Province

The test for extensive management field crops in high cold region northwest of Hebei province with vegetables partial nitrogen, fertilizer and fertilizer arbitrary period, which directly affects the environmental quality of vegetable fields, but also resulted in economic waste and limit the production of vegetables'further improve and quality improvement. With White radish named 'Spring Snow Holy', This experiment was studied from June to October in 2009, conducted on Zhang Bei's experiment station of agriculture university of HeBei.Including the effect of potassium white radish yield, quality and characteristics of potassium and nitrogen absorption of different radish harvest yield and quality, nutrient characteristics of study, reseached by field investigation, measurement and laboratory tests, to show the systematic study the northwest plateau of Hebei N and K White radish yield, quality and nutrient demand characteristics. The main results are as follows:K experiment shows that the core of root fresh weight of radish growth showed typical features of Logistics curve, while almost a linear increase in dry weight. Potassium fertilizer can not significantly increase the radish biomass by 0-225 kg/hm~2; white radish yield per unit area cost 53,215 ~ 56,562 yuan / hm~2, traditional food crops for the spring wheat area 8 to 10 times.The effect of potassium on plant growth and photosynthetic pigments and other indicators of the impact is not significant. Since the fleshy root growth period after the rapid accumulation of biomass of white radish, under the strains of different amount of plant potassium, especially potassium content of the roots of performance characteristics of a stable concentration has been to maintain the level of 1.849% ~ 2.238%. White radish in cold areas in Northwest of Hebei province demonstrated excellent use of ecological adaptability and economy of potassium.The N experiment results showed that the effect of nitrogen fertilizers in the nitrogen 0~225 kg/hm~2 scopes, the core of root fresh weight of radish growth showed typical features is not remarkable after the seedling 70 days, the core of root fresh weight of radish growth showed typical features is remarkable after the seedling 90-100 days by the nitrogen 150~225 kg/hm~2 scopes, the most long of leaves, the most biggest width of leaves, With the increase of nitrogen fertilizer, white radish biomass production, economic output and the root yield increased with the increase of economic output per kg of nitrogen from the negative to a positive correlation, and the growth yield is also growing. N 150 kg/hm~2, P2O5 120 kg/hm~2, K2O150 kg/hm~2 is the high alpine zone of white radish, efficient and low consumption is the best fertilizer.Appropriate amount of nitrogen fertilizer can increase the plant's largest leaf length, maximum leaf width, number of photosynthetic leaves, root length, root diameter, white radish dry matter accumulation in various organs and a positive correlation between nitrogen, nitrogen deficiency reduced dry matter accumulation amount. The nitrogen can promote a certain amount of vegetative organs of plant dry matter accumulation of leaves, to provide guarantees for the root growth. Dry matter accumulation results show that: N225≥N150 > N75 > N0 > CK.Nitrogen can significantly promote the chlorophyll a, chlorophyll b and carotenoid content increased, and both showed nearly linear growth trend, the growth rate of chlorophyll a is higher than chlorophyll b and carotenoid content. With the harvest delays senescence associated with chlorophyll a, Chlorophyll b and carotenoid content decreased photosynthetic pigment synthesis decreased gradually extend the amount of nitrogen can be stable photosynthetic pigments.N treatment with the soluble sugar content decreased with increasing nitrogen, no significant difference between the treatments, nitrogen can not significantly change the white radish leaf soluble sugar content. With the delayed harvest, leaf soluble sugar content increased significantly, from 70 days after shooting an average of 8.77% increase to 100 days after shooting an average of 15.49%, the root of the soluble sugar content increased significantly, from Postemergence25.90% 70 days after shooting 100 days increased to 35.68%。Alpine areas in northwestern Hebei climate and soil conditions, compared with the control treatment turnip K annual water consumption and water use efficiency were higher, K 0 ~ 225 kg/hm~2 range of white radish did not affect water consumption obvious. K 150 kg/hm~2 highest when the water use efficiency. With the postponement of harvest, the fertility of white radish showed an increase of water consumption, water use efficiency decreased. Postemergence 100 days maximum field water consumption, water use efficiency increased with the nitrogen parabolic trend, N150 maximum, 90 days after shooting was 507.9 kg/hm~2 mm, after shooting 100 days to 489.7kg/hm~2 mm, significantly higher than the 70 days after shooting.N 150 kg/hm~2 the harvest period when the highest water use efficiency, an appropriate amount of nitrogen can promote water use efficiency, too high or too low to reduce the quantity of fertilizer.