Cotton Effect Of Nitrogen At Different Ratio

With the materials of DP99B, Field and potted(15N-tracer) Directseed at the same time, study the same amount of nitrogen(225 kg/hm2) fixed proportion of 40% in early spikelet under the premise of different proportion of nitrogen application(Before planting:At initial blooming:At peak blooming,A,0:4:6, B,1:4:5, C,2:4:4, D,3:4:3, E,4:4:2) on cotton growth, yield and its components, nutrient absorption and utilization, The impact of nitrogen use efficiency. The results showed that:1 Effects on cotton growth processPotted and field treatments thows that, the cotton growth period variation of the same. The ratio of different nitrogen has no effect on cotton seedling emergence, but a larger percentage of the late N treatment as earlier budding, earlier flowering, later boll opening, growth period was prolonged, while the smaller proportion of the late N treatment later budding, later flowering, earlier boll opening, growth period was reduced.2 Impact on agronomic traits, yield and its component factorsThe ratio of different nitrogen treatments had no significant effect fruiting branches beginning section, a large proportion of pre-treatment of N C,D higher than the other treatments, and significant differences between treatments, number of fruit branches, fruit number and section number, along with the late loss nitrogen followed by the decrease of the proportion of reduced significantly different between treatments.Potted and field cotton seed cotton yield in each treatment showed the following decreasing order of percentage of nitrogen decreased, and significant differences between treatments. A pot handle than other treatments were increased by 7.6%,12.4%,30.4%, 43.0%, significant difference between treatments, lint treatment A than treatment E increased by 11.4%, A boll weight handling the largest 4.75g, and processing B were not significantly different, but significant differences with the other treatment than treatment B, C, D, E increased 15.6%,32.3%,19.6%,24.7%.3 Impact on physiological and biochemical characteristics of cottonThe processing function of leaf chlorophyll content of main stem in the whole growth period showed fluctuations, but the overall trend of gradual increase, reaching a peak and then decreased gradually. Within 59d of cotton seedlings, the chlorophyll content was:E> D>C> B> A, after the emergence 59d, was A> B>C> D> E. Soluble protein content of higher budding, the whole growth of all treatments showed decreased gradually after emergence 73d, the processing protein content was A>B>C>D>E. 4. Impact on dry matter accumulation of cottonThe growth and development of the same treatment, that the whole growth process in the early dry matter accumulation showed slow growth, medium straight up, post steady growth, the accumulation dynamics of plant growth, consistent with "S" curve can be fitted with the Logistic equation. Cotton dry matter accumulation of vegetative organs of the earliest, the deal with 59-70d after emergence to reach the maximum growth rate, total dry mass accumulation Second.5 Impact on Nutrient uptake on cottonCotton nitrogen content at different growth stages, the differences between different treatments vary. The processing of root, stem, leaf nitrogen content significantly different, and showed to deal with A minimum of total nitrogen in each organ to deal with E total nitrogen in each organ was the highest organ in the proportion of total nitrogen fertilizer with the increase in pre-gradually increasing, the processing organ in the total phosphorus and total potassium, no significant difference.6 Characteristics of N nutrition in the cotton organBud of cotton absorb nitrogen from the soil in the main nitrogen source, whole plant N accumulation from the average soil nitrogen content 17.44mg, much larger than the average nitrogen content of nitrogen from fertilizer 3.34mg; early flowering stage to boll opening of cotton growth and development based mainly on reproductive organs, early flowering fertilizer nitrogen and soil nitrogen in the cotton content of the various organs and ratio are:bud and Flower> fruit branches leaves> roots;...