An iron-ion supply material capable of efficiently supplying iron ions to plants is provided. An iron-ion supply material that acts as an iron-ion supply source for supplying iron ions contributing to plant growth comprises an iron powder having an iron content of 80% by mass or more, wherein 50% by mass or more of the whole iron powder has a particle size of 100 m or more and 10 mm or less.

An iron-ion supply material capable of efficiently supplying iron ions to plants is provided. An iron-ion supply material that acts as an iron-ion supply source for supplying iron ions contributing to plant growth comprises an iron powder having an iron content of 80% by mass or more, wherein 50% by mass or more of the whole iron powder has a particle size of 100 m or more and 10 mm or less.

[Object] Provided is a steelmaking slag-coated seed and a method for producing the same, which can be produced with less time and effort of a worker and at lower cost, and yet can include a sufficient amount of a uniform coating layer based on steelmaking slag.

[Solution] A steelmaking slag-coated seed includes a seed of a rice plant or the like and a steelmaking slag layer formed on an outside of the seed; the steelmaking slag layer is a covering layer made of steelmaking slag powder obtained by pulverizing steelmaking slag; the steelmaking slag contains a prescribed amount or more of calcium relative to all components of the steelmaking slag.

An integrated eliminating device and its method for initial runoff pollution is provided, wherein a plurality of the water receiving pipes for collecting initial runoff are gathered and connected to the first water reservoir, one end of the water inlet pump is connected with the first water reservoir via the water receiving pipes, and the other end of the intake pump is connected with an water inlet opening of the rice field; the rice field is divided into a plurality of sub-parcels in a shape of long stripes, a regulating gate is set. An outlet of the rice field is communicated with the second water reservoir and which is communicated with the water inlet opening of the rice field via the reflux pump.

An integrated eliminating device and its method for initial runoff pollution is provided, wherein a plurality of the water receiving pipes for collecting initial runoff are gathered and connected to the first water reservoir, one end of the water inlet pump is connected with the first water reservoir via the water receiving pipes, and the other end of the intake pump is connected with an water inlet opening of the rice field; the rice field is divided into a plurality of sub-parcels in a shape of long stripes, a regulating gate is set. An outlet of the rice field is communicated with the second water reservoir and which is communicated with the water inlet opening of the rice field via the reflux pump.

The present invention relates to the field of environmental protection, and in particular to a leaf surface barrier for ac- curately controlling cadmium absorption and transport related gene expression in rice, and an application thereof. The present inven- tion comprises: reducing a raw material, i.e., selenious acid or selenite, by using ascorbic acid to generate a nanogel, and then emul- sifying the managed for peptization to obtain a leaf surface barrier for accurately controlling cadmium absorption and transport re- lated gene expression in rice; and then mixing the leaf surface barrier with a silica sol to obtain a composite selenium and silica sol leaf surface barrier. The present invention also provides a leaf surface barricading method for accurately controlling cadmium ab- sorption and transport related gene expression in rice. By applying the leaf surface barrier, the silica sol or the composite selenium and silica sol leaf surface barrier having a particular atomization degree and a particular contration by means of foliar spray dur- ing a particular growth period of rice and within a particular time, the cadmium accumulation in rice can be effectively reduced. Ap- plying the present invention to a moderately or lightly polluted field can enable cadmium content in rice to satisfy the food hygiene standards, and therefore is significant for achieving the safe use of the large area of field polluted by heavy metal cadmium in China.

The present invention relates to the field of environmental protection, and in particular to a leaf surface barrier for ac- curately controlling cadmium absorption and transport related gene expression in rice, and an application thereof. The present inven- tion comprises: reducing a raw material, i.e., selenious acid or selenite, by using ascorbic acid to generate a nanogel, and then emul- sifying the managed for peptization to obtain a leaf surface barrier for accurately controlling cadmium absorption and transport re- lated gene expression in rice; and then mixing the leaf surface barrier with a silica sol to obtain a composite selenium and silica sol leaf surface barrier. The present invention also provides a leaf surface barricading method for accurately controlling cadmium ab- sorption and transport related gene expression in rice. By applying the leaf surface barrier, the silica sol or the composite selenium and silica sol leaf surface barrier having a particular atomization degree and a particular contration by means of foliar spray dur- ing a particular growth period of rice and within a particular time, the cadmium accumulation in rice can be effectively reduced. Ap- plying the present invention to a moderately or lightly polluted field can enable cadmium content in rice to satisfy the food hygiene standards, and therefore is significant for achieving the safe use of the large area of field polluted by heavy metal cadmium in China.

The invention relates to novel nitrification inhibitors of formula I, which are substituted thiazolidine compounds. Moreover, the invention relates to the use of compounds of formula (I) as nitrification inhibitors, i.e. for reducing nitrification, as well as agrochemical mixtures and compositions comprising the nitrification inhibitors of formula (I).

A method and an apparatus for systematized cultivation of grain crops are disclosed involve a conveying unit, a sowing unit, a seedling-growing/warehousing unit, an irrigating/draining/fertilizing unit, a canopying unit, a harvesting unit, a soil treating unit, and a liquid-fertilizer fermenting unit. The conveying unit conveys culture boxes in a cyclic process to distribute plants in the seedling-growing/warehousing unit and the irrigating/draining/fertilizing unit for cultivation. The culture boxes cultivating plants related to other system operations not corresponding to the growth period are conveyed to other areas through the cyclic process. Since operations in the seedling-growing/warehousing unit and the irrigating/draining/fertilizing unit corresponding to the growth period and the other system operations for the grain crops are conducted simultaneously and synchronously, the grain crops can be continuously, cyclically fed into the cultivation system for seedling and growth until they can be harvested, so as to increase harvests per year and the overall yield.

A method and an apparatus for systematized cultivation of grain crops are disclosed involve a conveying unit, a sowing unit, a seedling-growing/warehousing unit, an irrigating/draining/fertilizing unit, a canopying unit, a harvesting unit, a soil treating unit, and a liquid-fertilizer fermenting unit. The conveying unit conveys culture boxes in a cyclic process to distribute plants in the seedling-growing/warehousing unit and the irrigating/draining/fertilizing unit for cultivation. The culture boxes cultivating plants related to other system operations not corresponding to the growth period are conveyed to other areas through the cyclic process. Since operations in the seedling-growing/warehousing unit and the irrigating/draining/fertilizing unit corresponding to the growth period and the other system operations for the grain crops are conducted simultaneously and synchronously, the grain crops can be continuously, cyclically fed into the cultivation system for seedling and growth until they can be harvested, so as to increase harvests per year and the overall yield.