Study Of Nutrition Diagnosis And Balanced Fertilization Of Camellia Oleifera

Camellia oleifera(Camellia oleifera Abel) is a world famous woody species, originally planted in China which remains one of the most important production areas in the world. Camellia oleifera oil is a high-end health food, as people seek to improve their quality of life. While the demand for Camellia oleifera oil is increasing, our Camellia oleifera oil yield per unit area and overall efficiency are very poor, thus losing its competitiveness in the market. What is more, deteriorating site conditions, together with the lack of the woodland long-term scientific and nutrient management, is threatening the sustainable development of the Camellia oleifera. Reasonable and sufficient soil nutrition is the premise for high production, and scientific management of woodland nutrients is the precondition for efficient and sustainable development. Balanced fertilization means taking care of the nutrients based on the law of the nutrient needs of Camellia oleifera woodland. This thesis studied the soil nutrients, photosynthetic physiology, growth and yield of Camellia oleifera forest of balanced fertilization. It aims to offer some scientific basis for studying the impact of Nutrient content of Camellia oleifera leaves diagnosis on balanced fertilization of soil fertility adjustment, draw up a reasonable soil fertilizer system, and accelerate reasonable soil ecologic circulation and sustainable development of Camellia oleifera forest. The main conclusions can be drawn as follows:1. The results of vector diagnosis analysis show that N1P3K2 and N1P3K3 can basically meet the nutrient needs of the growth of the Camellia oleifera. SPAD values bear a linear relationship with leaf nitrogen content. The critical value of SPAD is 61.37, which can be used to judge whether the supply of nitrogen is adequate. Each of the above two nutrition diagnostic methods has its own advantages and disadvantages. Therefore, it is recommended that in the actual production they should be used in conjunction with each other in order to obtain more comprehensive and more accurate results.2. The soil pH value is 4.5 in the institutional forest in Xinyu. The soil is lacking not only in organic matter content and nutrient content, but also in a large number of nutrient elements like N, P, Zn and Mg. The forest has stronger absorption fixation capacity of P, K. B, which are less than the deficiency threshold. The relative yield of soil pot experiment and absorption constant were consistent with chemical analysis, which indicated that both the extent of P and N are currently the two major limiting factors and K is a potential limiting factor while the level of B, S, Mo, Zn, Fe, Mn, and Cu are high. Therefore, attention should be paid in the fertilization experiments of Camellia oleifera forest to balance N, P, K fertilizer application in order to achieve high and stable yield of Camellia oleifera forest.3. Balance fertilization could obviously improve soil physical, chemical properties and enzyme with the most obvious effect on N1P3K3. Close relationships were identified between nutrition treatments and soil fertitily, of which that between enzyme vitality under different nutrition treatment and soil fertility was the most significant. After a comprehensive evaluation of each sample soil taken from different places, the average score value of the order is, N1P3K3>N1P1K3>N1P2K3>N1P3K4>N1P3K2>N1P4K3> NIP3K1>N1P0K3>N1P3K0>CK.4. The growth accelerated after fertilization because of the improved soil fertility at Camellia oleifera forest. Fertilization can significantly increase the Camellia oleifera hight, crown width and diameter growth. The growth rate of the fertilization treatments was higher than that of control treatment. The fertilization treatments showed changes in height growth following the order of N1P2K3>N1P4K3>N1P0K3>N1P1K3>N1P3K4>N1P3K2 >N1P3K0>CK>N1P3K1>N1P3K3. The changes of crown growth were N1P2K3>N1P3K1 >N1P0K3>N1P3K2>N1P3K4>N1P4K3>N1P3K0>N1P1K3>N1P3K3>CK, and the changes of diameter growth were N1P0K3>N1P3K3>N1P2K3>N1P3K0>N1P1K3>N1P4K3 >N1P3K4>N1P3K1>N1P3K2>CK. The above orders could lead to the conclusion that Camellia oleifera processed with N1P2K3 and N1P0K3 grows best.5. The changes of net photosynthetic rate presented a single peak curve in treatments under natural conditions with the net photosynthetic rate reaching the maximum at 13:00, N1PK3、N1P3K0、N1P2K3 and N1P3K4 higher than the control. The WUE under different fertilizer treatments is different at different times in different conditions of Camellia oleifera, following the order of N1P3K1>N1P3K0>N1P3K3>N1P4K3>N1P0K3>N1P3K2 >N1P1K3>N1P3K4>N1P2K3>CK. The Cond of different fertilizer treatments resulted in single peak curve, with the Cond of N1P3K0 higher than other treatments.6. Fastest growth rate was achieved by applying compound fertilizer and spraying 0.020 mg/L brassinolides(BRs); Specialty fertilizer and 0.020 mg/L BRs could obviously increase canopy widths; Specialty fertilizer and 0.033 mg/L BRs could significantly improve SPAD value; No fertilization and 0.067 mg/L BRs resulted in the highest N content of leaves, followed by the combination of special fertilization and 0.033 mg/L BRs; Organic fertilizer and 0.020 mg/L BRs brought about the highest P content of leaves; Compound fertilizer and 0.020 mg/L BRs meant the highest K content of leaves; And specialty fertilizer and 0.033 mg/L BRs equaled the highest dry matter content of leaves.7. In the above five tested factors, BRs was the factor with the most significant effect on leaves NPK contents, flowering and seed kernel oil rate of Camellia oleifera, followed by the amount and frequency of watering, with fertilization having the least significance. The effect of various treatments on leaves N content and flower number could be calculated through quadratic polynomial equation of curve, which guarantees dependable reproducibility. Although a quadratic polynomial equation is not dependable when adopted to calculate leaves potassium, phosphorus content and seed kernel oil yield of Camellia oleifera, the experiment is of some reference value thanks to its good reproducibility; when applied alone, water, N, P, K, and BRs would each decrease leaf nitrogen and potassium contents of Camellia oleifera before increasing them as the amount applied increased while an opposite trend was noticed for leaf phosphorus content. However, no apparent regularity was found in the seed kernel oil rate and the flowering.8. Fertilization significantly increased the production of Camellia oleifera. The average yield of each fertilization treatment is higher than the average yield of CK,N1P3K2 fertilization treatment is the highest yield. At certain N.K, Camellia oleifera yield with K fertilizer amount increased, At certain N, K, and P fertilizer increased yield of Camellia oleifera is directly proportional to the quantity of fertilizer, but K and P fertilizer high had no significant effect on Camellia oleifera yield.N1P3K2 produced the highest annual earnings, followed by N1P1K3 and N1P3K0 processing. At certain N,K,...