The Effects Of Fertilization And Plant Density On The Nutrient Physiology, Yield And Quality Of Ramie

Ramie variety “0501” was used in this research. We used orthogonal rotated combination design to studied (1)the regulators of nutrient accumulation and distribution in ramie,(2)the effects of fertilization and density in ramie’s fiber yield and fiber fineness. In the orthogonal rotated combination design we take four factors, such as nitrogenous fertilizer, manure fertilizer, potash fertilizer, ramie’s density, each factors have five levels, and carried out1/2. The main results were shown as following:1. Fertilization and density have a greater impact on nutrient content, nitrogen fertilizer have significantly effect on NPK contents in ramie, nitrogen fertilizer will promote the accumulation of nitrogen but to go against the accumulation of phosphorus and potash in the ramie plant. Potash fertilizer can increase the amount of phosphorus and potassium in the ramie leather.2. In the allocation and accumulation of nutrient analysis, leaf have the most nutrients, followed by stalk’s xylem, the least is ramie leather. But the potassium in stalks were significantly greater than the leaf. Affected by the climate, the content of elements change trend between first season and second season were different. At the first season, Nitrogen in bark at middle stage is higher than earlier stage, then reduce at anaphase. Phosphorus in leaf at the middle stage is more higher than earlier stage, but in stalk’s xylem and bark the Phosphorus were reduced. NK contents of the first season is lower than the second season, that’s because at middle stage the high temperature and drought make litter dry matter accumulation. In second season Phosphorus in stalk’s xylem is higher than bark while in first season the phosphorus in stalk’s xylem is same with bark. Throughout the growing period, the potassium content change trend in different parts is no different, first rapid decline then fall slowly. In the second season, The potassium in different parts are decreased linearly. In latter stage, the Potassium is transfer from stalk’s xylem to bark, which leads to potassium content in the bark becomes higher.3. By the correlation analysis of the nutrient element contents between different parts, the results show that the nitrogen content has negative impact with phosphorus and potassium, while phosphorus and potassium have positive impact with each other. There was a highly significant positive correlation between total nitrogen in stalk’s xylem and nitrogen in bark (r=0.73**), a highly significant positive correlation between total phosphorus in stalk’s xylem and phosphorus in bark (r=0.56**), a highly significant positive correlation between total potassium in stalk’s xylem and potassium in bark (r=0.77**). Nutrient content have great influence with ramie yield, there was a significant positive correlation between fiber yield and nutrient content (rlea=0.49*, rXylem=0.49*, rbark=0.50*). A significant positive correlation between potassium in bark and fiber yield (r=0.41*), the phosphorus content has negatively correlated with the fiber yield but not to significant levels. Nutrient content have influence with agronomic characters a significant positive correlation between plant height and nitrogen in stalk’s xylem or bark (rxylem=0.41*,rbark=0.45*), a highly significant or significant positive correlation between the fresh skin of ramie and nitrogen contents (rlef=0.50*, r xylem=054**, rbark=0.49*).4Mathematical models of new ramie variety0501between fiber yield and the management measure, such as Fertilization and density were established. From the model, when XI=1.682、 X2=-1.682. X3=-1.682、X4=1.682, the raw fiber yield was higher than389.80kg/667m2.5Mathematical models of new ramie variety0501between fiber fineness and the management measure, such as Fertilization and density were established. From model, when X1=0、X2=1.682、 X3=1.682. X4=-1.682, the fiber fineness was higher than2417.84Nm.