The Research And Application Of Nutrition And Physiological Characteristics Of Fentures Grains Of Bacca Sedge

To explore the reasonable technique of fertilization, potted experiment was carried out to researc h on the nutritional characteristics of research regulation experiment and growth and development of nutritional characteristics of Bacca sedge. Through the observation of growth and development of Bacca sedge, and provide a theoretical basis for the development of high- yielding planting and cultivation measures of Bacca sedge in Guizhou; study the characteristics of the absorption of nutrients can clear appropriate amount of fertilizer needed for the production of Bacca sedge: N utrition C haracteristics of regulation, to explore reasonable planting density, nitrogen application rate is reasonable and effective fertilization measures to provide a theoretical basis for Bacca sedge.Bacca sedge growth and development of the research results show that: the total growing period of Bacca Sedge is 136 days in Guiyang, the number of leaves are 25 to 28, Bacca sedge growth period can be divided into six stages: seedling, tillering, jointing, booting, heading and flowering, maturity. Bacca sedge growth process is divided into vegetative and reproductive growth of two major stages; bootstrap 3 to 4 leaf stage show began to enter the tiller, tiller for 45 days, the average number of tillers per plant Bacca sedge for three or so, the maximum tiller number is five. According to the exuberant tillering stage of Bacca sedge, the exhibition is the best fertilizer during the 4 to 5 leaf of tillering. Show 12 leaves that is tiller critical period of Bacca sedge; the height growth dynamics of Bacca sedge that curve showing an "S" to meet the logistic function; leaf area is the fastest growing at the jointing stage and booting, heading and flowering reached a peak maturity with senescence, leaf area decreased.The dry matter accumulation dynamics of Bacca sedge results show that: The whole plant photosynthetic products accumulation dynamics exhibits characteristics is slow- fast- slow. The dry matter accumulation is a little before jointing,but after that the dry matter accumulation into the fast growing in the jointing to heading and flowering, reaching the peak of the growth and development of the entire booting dry matter accumulation day amounted 1.14 g / strain; slowing growth rate after maturity, dry matter accumulation day for 0.55 g / strain. The Bacca sedge at booting is in a strong growth period, promoting the accumulation of vegetative period will help improve the yield of Bacca sedge.The nutrients absorption characteristics of the study of Bacca sedge results show that: the distribution of Bacca sedge performance relative content of nitrogen in v arious organs of leaf> stem> root> ear. Booting is the largest nitrogen nutrition efficiency of Bacca sedge,after that, there are still large plants still absorb nitrogen, nitrogen supply in order to obtain high yield should pay attention in the late; Bacca sedge phosphorus absorption of less, phosphorus absorption peak of the heading and flowering; Bacca sedge behind nitrogen uptake of potassium, Potassium absorption peak at booting, the higher the concentration of the pre-K to maturity potassium loss, resulting in a concentration decline; the peak of calcium absorption in the heading and flowering, daily absorption of 20.77 mg / strains producing 1K g barnyard red grain, need to absorb nitrogen(N) 83.560 g,(P) 21.005 g,(K) 73.479 g,( Ca) 57.198 g, NPK ratio of nutrient content of N:P2O5:K2O = 1: 0.25: 0.88.Bacca sedge tiller features findings indicate: nitrogen fertility under the same conditions, the pot when eight more effective tillers, panicles and higher into the spike rate, with increasing density leads to decreasing the number of tillers ineffective tillers increased red barnyard into spikes and spike rate with increasing population density decreased gradually; population density under the same conditions, with the increasing amount of nitrogen, to a certain extent, the dela y of the Bacca sedge the tiller and tiller extension of the Bacca sedge invalid duration, by contrast T1 and T2 can effectively control ineffective tillers duration; the regulation of nitrogen found by comparing different periods, B4 deal that proportion o f nitrogen application for basal: tillering: panicle = 0.6: 0.2: 0.2, the maximum tiller number, and finally into a spike into the spike rate better performance can be improved planting red barnyard yield economic benefits.Bacca sedge nitrogen effects research show that: in the same population density, T2 treatment, that the amount of nitrogen fertilizer 45 Kg / hm2 Bacca sedge kernel number, seed diameter, grain weight and yield the best performance, the high amount of nitrogen can cause excessive vegetative growth early barnyard red, can not reasonably coordinate Bacca sedge vegetative and reproductive growth of the relationship, resulting in a waste of resources; study different periods of Bacca sedge fertilizer yield traits and yield results showed that: B1 handle various yield and yield showed the lowest, B4 processing grain weight and yield significantly higher than B3, B2, B1. Processing B4 yield up 45.57 K g / acre. Therefore, B4 handle that proportion of nitrogen application for basal: tillering: panic le = 0.6: 0.2: 0.2 help to improve the yield of Bacca sedge, can provide a theoretical basis for the high- yielding planting Bacca sedge.