The present invention discloses a method for safe production of rice on soil mildly and moderately polluted by heavy metals. The method includes applying a passivator before transplanting rice seedlings to reduce activity of heavy metals in soil, and then spraying a foliar barrier from the peak tillering stage to the booting stage of rice and at the filling stage of rice; the passivator includes bentonite, gypsum powder, lime, a biochar, an iron-based biochar, a slow-release iron-based biochar, an iron-sulfur-silicon composite biochar, a heavy metal cadmium passivator and a cadmium-arsenic synchronous passivator for activating sulfur reducing bacteria in paddy soil; and the foliar barrier includes an acid silica sol, a selenium-silicon composite sol, a cerium composite silica sol, a ferrous modified selenium sol. The method can also include applying a nitrate nitrogen fertilizer at the seedling stage of rice, and/or applying a phosphorus potassium fertilizer at the tillering stage of rice.

The present invention discloses a method for safe production of rice on soil mildly and moderately polluted by heavy metals. The method includes applying a passivator before transplanting rice seedlings to reduce activity of heavy metals in soil, and then spraying a foliar barrier from the peak tillering stage to the booting stage of rice and at the filling stage of rice; the passivator includes bentonite, gypsum powder, lime, a biochar, an iron-based biochar, a slow-release iron-based biochar, an iron-sulfur-silicon composite biochar, a heavy metal cadmium passivator and a cadmium-arsenic synchronous passivator for activating sulfur reducing bacteria in paddy soil; and the foliar barrier includes an acid silica sol, a selenium-silicon composite sol, a cerium composite silica sol, a ferrous modified selenium sol. The method can also include applying a nitrate nitrogen fertilizer at the seedling stage of rice, and/or applying a phosphorus potassium fertilizer at the tillering stage of rice.

The invention discloses a method of rapid generation-adding breeding of rice in the technical field of rice breeding, including soaking seeds of the rice, germination, seedlings cultivation, managing and regulating of the rice at the growth stage, and harvesting the rice. The managing and regulating the rice at the growth stage includes dynamic light quality and photoperiod control in vegetative growth period, heading period and pustulation period; growth period involves light environment regulation with the ratio of red light:blue light:white light of 0.8-1:0.8-1:1.0, photoperiod of 16-18 h; heading period involves light environment regulation with the ratio of red light:blue light:white light of 1-2:0.5-1:1, photoperiod of 12-13.5 h; and pustulation period includes light environment regulation with the ratio of red light:blue light:white light of 1-2:1:1, photoperiod of 16-18 h.

The invention discloses a method of rapid generation-adding breeding of rice in the technical field of rice breeding, including soaking seeds of the rice, germination, seedlings cultivation, managing and regulating of the rice at the growth stage, and harvesting the rice. The managing and regulating the rice at the growth stage includes dynamic light quality and photoperiod control in vegetative growth period, heading period and pustulation period; growth period involves light environment regulation with the ratio of red light:blue light:white light of 0.8-1:0.8-1:1.0, photoperiod of 16-18 h; heading period involves light environment regulation with the ratio of red light:blue light:white light of 1-2:0.5-1:1, photoperiod of 12-13.5 h; and pustulation period includes light environment regulation with the ratio of red light:blue light:white light of 1-2:1:1, photoperiod of 16-18 h.

The invention relates to the field of slow/controlled release fertilizer, in particular to a urea-formaldehyde-based multi-nutrient slow/controlled release fertilizer and a preparation method thereof. The urea-formaldehyde-based multi-nutrient slow/controlled release fertilizer comprises ammonium polyphosphate, inorganic silica gel and urea-formaldehyde, wherein the phosphorus-oxygen double bond of ammonium polyphosphate can at least form hydrogen bond linkage with a urea-formaldehyde molecule chain, the hydroxyl group of the inorganic silica gel can at least form hydrogen bond linkage with the urea-formaldehyde molecular chain, and ammonium polyphosphate, inorganic silica gel and urea-formaldehyde together form a hydrogen bond associated polymer network structure. The invention can prepare a urea-formaldehyde-based multi-nutrient slow/controlled release fertilizer comprising a strong hydrogen bond network structure by using a conventional aqueous solution polymerization in combination with a normal temperature extrusion granulation process, avoiding the coating process in the latter stage of the preparation of a coated fertilizer, achieving a simple and effective preparation process, and saving a lot of manpower and material resources. The urea-formaldehyde-based multi-nutrient slow/controlled release fertilizer provided by the invention can stably and continuously release nitrogen nutrient throughout the release period, thereby making up for the shortcoming of excessively long nutrient release period of the existing urea-formaldehyde fertilizers.

The present invention discloses a method for safe production of rice on soil mildly and moderately polluted by heavy metals. The method includes applying a passivator before transplanting rice seedlings to reduce activity of heavy metals in soil, and then spraying a foliar barrier from the peak tillering stage to the booting stage of rice and at the filling stage of rice; the passivator includes bentonite, gypsum powder, lime, a biochar, an iron-based biochar, a slow-release iron-based biochar, an iron-sulfur-silicon composite biochar, a heavy metal cadmium passivator and a cadmium-arsenic synchronous passivator for activating sulfur reducing bacteria in paddy soil; and the foliar barrier includes an acid silica sol, a selenium-silicon composite sol, a cerium composite silica sol, a ferrous modified selenium sol. The method can also include applying a nitrate nitrogen fertilizer at the seedling stage of rice, and/or applying a phosphorus potassium fertilizer at the tillering stage of rice.

The present invention discloses a method for safe production of rice on soil mildly and moderately polluted by heavy metals. The method includes applying a passivator before transplanting rice seedlings to reduce activity of heavy metals in soil, and then spraying a foliar barrier from the peak tillering stage to the booting stage of rice and at the filling stage of rice; the passivator includes bentonite, gypsum powder, lime, a biochar, an iron-based biochar, a slow-release iron-based biochar, an iron-sulfur-silicon composite biochar, a heavy metal cadmium passivator and a cadmium-arsenic synchronous passivator for activating sulfur reducing bacteria in paddy soil; and the foliar barrier includes an acid silica sol, a selenium-silicon composite sol, a cerium composite silica sol, a ferrous modified selenium sol. The method can also include applying a nitrate nitrogen fertilizer at the seedling stage of rice, and/or applying a phosphorus potassium fertilizer at the tillering stage of rice.

An agricultural field management system includes a first sensor to generate first field work data indicating field conditions of an agricultural field and a second sensor to generate second field work data indicating crop conditions. A computer includes a memory configured to store a field database in which data are segmented by: a field map layer in which field shape data defining a shape of an agricultural field are stored; a first field work layer in which the first field work data are stored; and a second field work layer in which the second field work data are stored. The agricultural field is divided into common field blocks in the field map layer, in the first field work layer, and in the second field work layer such that the field conditions in the common field blocks are annually correlated with the crop conditions in the common field blocks, respectively.

An agricultural field management system includes a first sensor to generate first field work data indicating field conditions of an agricultural field and a second sensor to generate second field work data indicating crop conditions. A computer includes a memory configured to store a field database in which data are segmented by: a field map layer in which field shape data defining a shape of an agricultural field are stored; a first field work layer in which the first field work data are stored; and a second field work layer in which the second field work data are stored. The agricultural field is divided into common field blocks in the field map layer, in the first field work layer, and in the second field work layer such that the field conditions in the common field blocks are annually correlated with the crop conditions in the common field blocks, respectively.

Means and methods are provided to produce abiotic stress tolerant plants with improved yield based on the specific identification of a DNA methylation signature in the plants out of a population of the plants. The methods involve identification and utilization of epigenetic features of a plant with high energy use efficiency.