Abstract: A method for improving paddy fields by stirring and discharging slurry, including steps of rotary tillage scarifying, irrigation and paddy field soaking, slurry stirring, slurry layering, slurry discharging, airing, and water storing. The method for improving paddy fields by stirring and discharging slurry can quickly and greatly reduce soil salinity, with a cost lower than 1,000 yuan/hm2, a yield of 5,065 kg/hm2 to 6,304 kg/hm2; it saves the step of water harrowing before conventional rice planting and transplanting, and offers simple operation and promising prospect of replication and popularization, providing important support for increasing grain in soda saline-alkaline areas in the western Songnen Plain.

Abstract: Disclosed is a special soil conditioner for soda saline-alkaline paddy fields and a preparation method thereof, relating to the technical field of soil conditioner preparation. The raw materials of the soil conditioner include calcium chloride dihydrate, anionic polyacrylamide, mineral potassium fulvate, diethylaminoethyl (DA) polyamine, DA-7 or DA-8, brassinolide, potassium indolebutyrate, sodium ?-naphthylacetate and powder anti-caking agent. The above components are mixed according to a specific weight ratio to obtain the special soil conditioner for soda saline-alkaline paddy fields.

Abstract: The present invention provides a variable rate precision fertilizer applicator, comprising a connecting plate, a fertilizer bin and a fertilization mechanism. A plurality of connecting belts are fixed on the connecting plate; the connecting plate is connected with a fertilization unmanned aerial vehicle (UAV) through the connecting belts; a connecting column is fixed on a bottom surface of the connecting plate, and the connecting plate is fixedly connected with the fertilizer bin through the connecting column; a storage bin is separated into a solid bin and a liquid bin through a partition plate; a release bin is arranged on one side of the storage bin; the spiral feeding cylinder is installed in the solid bin; a liquid pump is installed in the liquid bin; the discharge port is installed in the release bin; the fertilization mechanism is installed at the bottom side of the fertilizer bin.

Abstract: Disclosed is a method for maize cultivation in the black soil area of northeast China, including the following steps that can be conducted in any order: A. conservation tillage with straw returning: after a crop is harvested in autumn, raking and concentrating straws in rows; B. when sowing, disposing a front-loaded returning device on a sowing machine for a second concentration; C. when sowing, increasing the number of plants through a wide- and narrow-row effect; D. additional application of an organic bacterial fertilizer: where, the organic bacterial fertilizer includes a base fertilizer and a seed fertilizer; the base fertilizer refers to 500 kg of a 40% organic-inorganic mixed slow-release fertilizer; the seed fertilizer refers to 80 kg of an organic bacterial fertilizer; E. weeding with a herbicide treated by a secondary dilution method; and F. subsoiling to break a plow pan in summer: subsoiling flat land parcels to 40 cm.

Abstract: The present disclosure relates to a method for microscopic examination of phytoplankton. The present disclosure solves the problem of decreased counting accuracy of perioptometry in a dry environment. The method is as follows: step 1, making an analyte into a glass slide, performing qualitative identification of the phytoplankton in the field of view; and step 2, drying the glass slide; after drying, counting the phytoplankton and full-slide rare algae on the glass slide microscopically. When the humidity of microscopy room is only 20%, the method of the present disclosure may count a sample accurately, which has a significant increase in counting accuracy compared with the existing perioptometry. The method of the present disclosure effectively solves the problem of failure to perform the perioptometry accurately due to dry ambient humidity.

Abstract: Disclosed are rice environmental conditional-lethal mutant gene osesl1, an encoding protein and use thereof The gene osesl1 has a nucleotide sequence shown as SEQ ID NO: 1 in the Sequence Listing. The encoding protein thereof has an amino acid sequence shown as SEQ ID NO: 2. After heading of osesl1 mutant rice, seed embryo lethal phenotype appears at 12 days after pollination, exhibiting darkening at the junction between embryo and endosperm. When an average temperature is below 22° C., a seed embryo is normal; when the average temperature is above 28° C., the seed embryo is lethal; when the temperature is between 22° C. and 28° C., the seed embryo is lethal under long daylight conditions (>13 h) and normal under short daylight conditions (<13 h). Use of the gene osesl1 in controlling seed embryo development of rice is further provided.