Various embodiments for determining fertilizer application for crops based on aerial-based vegetation indices are described. In one example, a method includes determining a relationship between an aerial vegetation index for a crop and tiller density of the crop. The method further includes creating a fertilizer application model for the crop based at least in part on recommended fertilizer application data for the crop and the relationship between the aerial vegetation index and the tiller density of the crop. The recommended fertilizer application data being correlated with the tiller density of the crop.

Various embodiments for determining fertilizer application for crops based on aerial-based vegetation indices are described. In one example, a method includes determining a relationship between an aerial vegetation index for a crop and tiller density of the crop. The method further includes creating a fertilizer application model for the crop based at least in part on recommended fertilizer application data for the crop and the relationship between the aerial vegetation index and the tiller density of the crop. The recommended fertilizer application data being correlated with the tiller density of the crop.

A method for monitoring rice bacterial blight includes: obtaining a multi-spectral image, severities of the rice bacterial blight, and accumulated temperature data of a rice field at different growth stages; obtaining resistance of rice varieties to the bacterial blight; extracting a mean canopy spectral reflectance of each plot in the rice field; conducting regression of the severity of the rice bacterial blight using a convolutional neural network based on the mean canopy spectral reflectance and the severity of the rice bacterial blight, and outputting a depth spectrum feature; training a disease severity regression model with the accumulated temperature data, the depth spectrum feature, and the resistance to the bacterial blight for each plot as an input and the corresponding severity as an output; and monitoring a severity of the rice bacterial blight in a to-be-monitored rice field using the disease severity regression model.

A method for monitoring rice bacterial blight includes: obtaining a multi-spectral image, severities of the rice bacterial blight, and accumulated temperature data of a rice field at different growth stages; obtaining resistance of rice varieties to the bacterial blight; extracting a mean canopy spectral reflectance of each plot in the rice field; conducting regression of the severity of the rice bacterial blight using a convolutional neural network based on the mean canopy spectral reflectance and the severity of the rice bacterial blight, and outputting a depth spectrum feature; training a disease severity regression model with the accumulated temperature data, the depth spectrum feature, and the resistance to the bacterial blight for each plot as an input and the corresponding severity as an output; and monitoring a severity of the rice bacterial blight in a to-be-monitored rice field using the disease severity regression model.

A weeding method of alternately cultivating ducks by block dividing in an organic rice field and an application thereof are provided. The method divides the organic rice field into blocks, and four blocks form an operation unit, and the ducklings are alternately cultivated simultaneously in each operation unit for the weeding.

The present disclosure provides a temperature control system of a rice paddy methane flux collecting device, which comprises: a chamber body having a collecting space in which a certain number of rice grains are located; a chamber door configured to open and close an upper side of the collecting space; a collecting unit configured to collect a sample gas in the collecting space; a heating unit and a cooling unit configured to increase or decrease the temperature in the collecting space; a circulation unit for circulating the gas in the collecting space; a ventilation unit configured to ventilate the collecting space; an external temperature sensor and an internal temperature sensor for measuring external and internal temperatures of the collecting space; and a temperature controller configured to control the above units to maintain the temperature in the collecting space to be equal to the external temperature.

The present disclosure provides a temperature control system of a rice paddy methane flux collecting device, which comprises: a chamber body having a collecting space in which a certain number of rice grains are located; a chamber door configured to open and close an upper side of the collecting space; a collecting unit configured to collect a sample gas in the collecting space; a heating unit and a cooling unit configured to increase or decrease the temperature in the collecting space; a circulation unit for circulating the gas in the collecting space; a ventilation unit configured to ventilate the collecting space; an external temperature sensor and an internal temperature sensor for measuring external and internal temperatures of the collecting space; and a temperature controller configured to control the above units to maintain the temperature in the collecting space to be equal to the external temperature.

A method for reducing seed production of barnyard grass in paddy fields is provided in the present application. The method for reducing seed production of barnyard grass in paddy fields includes: 1: selecting plots; 2: monitoring plant height; 3: observing seeds; 4: mowing barnyard grass; 5: utilizing barnyard grass; and 6: measuring seed yield. The method includes no hormones or pesticides.

A method for reducing seed production of barnyard grass in paddy fields is provided in the present application. The method for reducing seed production of barnyard grass in paddy fields includes: 1: selecting plots; 2: monitoring plant height; 3: observing seeds; 4: mowing barnyard grass; 5: utilizing barnyard grass; and 6: measuring seed yield. The method includes no hormones or pesticides.

Provided are a straw returning method through thawing and wet puddling for saline-sodic paddy fields and an application thereof, relating to the technical field of returning straws to fields in saline-sodic paddy fields. According to the disclosure, regional characteristics are fully considered, thawing is taken as the core and combined with wet puddling.