The application relates to the technical field of soil maintenance, in particular to a soil
nutrient holding and applying integrated device, which comprises a
fertilizer applying and preserving
machine, a mixing
assembly is installed on the
fertilizer applying and preserving
machine, the mixing
assembly comprises a discharging
barrel, two groups of discharging pipes are arranged at the lower end of the discharging
barrel, a stirring rod is rotationally connected in the discharging
barrel, and a plurality of first spray heads are arranged on the stirring rod. The two groups of bidirectional electric push rods are connected with the two groups of
tail wings through mounting seats to realize active angle adjustment, simultaneously drive the two groups of
tail wings to expand to adjust the
ditch width, meanwhile, the two groups of bidirectional electric push rods are connected with the two groups of blocking plates through connecting rods to drive the two groups of blocking plates to open the discharging ports of the two groups of discharging pipes, the
ditch width and the opening degree of the discharging ports of the two groups of discharging pipes are synchronously adjusted, the discharging amount and the
ditch width can be accurately matched, the
fertilizer application amount in unit ditch length is uniformly and stably ensured, the situation that the fertilizer is excessively applied or insufficiently applied is avoided, the adjustment operation is simplified, and the operation adaptability of the device and the consistency of fertilizer application and preservation are improved.