2 results about "Growth phase" patented technology

The invention discloses a method for producing astaxanthin by inducing Haematococcus pluvialis, which is characterized by comprising the following steps: in the vegetative growth phase, inoculating Haematococcus pluvialis in a nutrient culture medium, and culturing; continuously keeping irradiation on the Haematococcus pluvialis and ensuring that the intensity of illumination arriving at the Haematococcus pluvialis cell surface is 20-200 mu mol.m<-2>.s<-1>; in the induction stage, adding ethanol and seawater crystal into the production culture medium, wherein the ethanol added into the production culture medium accounts for 0.5-3 vol%, and the seawater crystal added into the production culture medium accounts for 0.5-1 wt%; and continuously introducing filtered air mixed with 1-3 vol% carbon dioxide into the production culture medium, wherein 0.2-0.4L/minute of the air is introduced to every 1L of production culture medium. The method can induce the Haematococcus pluvialis to quickly accumulate the astaxanthin, is simple and has the advantages of high yield and favorable effect.

The invention discloses a multi-axis shallow ploughing and ditching device for stubble cleaning. A three-point suspension is hooked on a rack and a bevel gear box and is used for rapidly hooking on various power heads; power is transferred from a tractor PTO output device to the bevel gear box; the bevel gear box transfers the power to a side transmission box; a multi-axis shallow ploughing and ditching assembly is connected with the side transmission box; the side transmission box transfers the power to the multi-axis shallow ploughing and ditching assembly to drive the multi-axis shallow ploughing and ditching assembly to move; a soil leveling plate assembly is mounted on the rack, is located above the multi-axis shallow ploughing and ditching assembly, and is used for leveling the soil and the surface. A stubble cleaning part, a shallow ploughing device and a ditching device are combined to realize the integration of chopping of residual stubbles of a rice panel field, rotary ploughing, ditching, soil throwing, shallow ploughing, soil crushing, soil leveling and surface leveling, and to reduce power consumption; meanwhile, multi-axis shallow ploughing is adopted, so that shallow ploughing soil aggregates are finely crushed, are more conducive to mechanized transplanting and growth of rapeseed seedlings, shorten the field growth phase, reduce production costs, and increase grain oil planting income.