The invention discloses a wheat soil
moisture prediction method based on a mixed PPLSTM model, and the method comprises the following steps: S1, obtaining soil
moisture data in a wheat growth period, and carrying out the preliminary screening of data features; s2, performing data preprocessing on the acquired soil
moisture data; s3, performing dimension reduction
processing on the high-dimensional features by using
principal component analysis (PCA); s4, optimizing hyper-parameters of the long short-
term memory (LSTM) network by using
particle swarm optimization (PSO); s5, inputting the optimized LSTM network into training data for training to obtain a prediction model; s6, testing the trained model by using the
verification set, and outputting a prediction result; and S7, optimizing parameters of the LSTM model according to a test result, and performing final training to obtain a model with optimal prediction precision. According to the method, the PSO optimization
algorithm, the PCA dimension reduction
algorithm and the LSTM network are combined, so that the problems that in a traditional method, high-dimensional input features are redundant, the time dependence relation capturing capacity is insufficient, and hyper-parameter selection depends on experience are solved. Compared with a traditional LSTM model, the method has the advantages that on the basis of keeping the
sequence modeling capability, the prediction precision and stability are remarkably improved, and a more reliable decision basis can be provided for intelligent
irrigation scheduling, so that the water-saving
irrigation practice is effectively promoted, and the
sustainable development of
precision agriculture is promoted.