Effects of different N feritilization modes and rates on the production and quality of king grass
In order to provide the reference about nitrogen rational use in king grass （Pennisetum purpureum × P. typhoideum）production, effects of different nitrogen levels and application methods on king grass growth and quality were studied by using pot culture experiment. The results indicated that N could im- prove yield and quality of king grass remarkably. The dry weight, plant height, the chlorophyll SPAD val- ue, nitrogen （~） and crude protein contents （~） of the king grass had positive correlation with N applica- tion. The contents of phosphorus （%）, potassium （%） and coarse fibre （%） had negative correlation with N application. The effect of N application at different periods on yield and crude protein content was not synchronization. Application N three times at different growth periods instead of one time at the beginning of growth period could remarkably increase the crude protein content. Further more, only application N three times with equal amount at different growth periods could conspicuously improved the dry weight of king grass. The most suitable N amount for king grass in our experiment was 3.48 g · pot-1 （about 180 kg. ha-1 nitrogen）. However, between 1.74-6.95 g · pot-1（90-360 kg·ha-1）the king grass could grow normally, less than 0.87 g·pot-1 （45 kg·ha-1 ）or more than 13.91 g·pot-1 （720 kg. ha 1）the growth was restricted; and no fertilization the growth was seriously retarded. Thus, the best fertilization way of king grass is to fertilize N with equal amount at stages of initial growth, tillering and jointing.
king grassnitrogen levelapplication methodyieldquality
国家科技期刊平台
NSTL
万方数据
维普
