| Soil degradation is serious in the black soil region of Northeast China.Soil nutrients and water storage capacity are reduced,which is not conducive to the development of agricultural production.Straw returning technology helps to protect the environment and improve soil physical and chemical properties.Spatial variability of crop information is an important basis for precision agriculture and can provide a theoretical basis for the rational arrangement of agricultural production.Therefore,this paper take the farmland in the black soil area as an example,the spatial variability of crop information under straw returning conditions is studied using geostatistics and multifractal,and the multifractal components of corn ear quality are studied.Multi-scale correlation characteristics with other crop information,results show:(1)The average of maize plant height remained unchanged after the first growing period.The average of stem diameter 、 chlorophyll content and leaf area all increased first and then decreased with the growth period.The variation in plant height and stem diameter decreased with the growth period,and the variation in chlorophyll content and leaf area decreased first and then increased.The variation of ear coarseness is weak,and that of other ear is moderate.(2)The spatial correlation range of maize plant height from maize seedling stage to mature stage first increased and remained unchanged.The spatial correlation range of stem diameter and leaf area gradually increased,and the spatial correlation range of chlorophyll content increased first and then decreased.Maize seedling and jointing stage plant height,maize seedling stage and mature stem diameter,corn jointing stage to filling stage chlorophyll content,corn seedling leaf area,row grains and ear grains have a strong spatial correlation,other growth periods Crop information is all medium spatial correlation.(3)The crop information has multifractal characteristics and the spatial variability of ear coarseness is mainly caused by its high value.The spatial variability of other crop information is mainly caused by its low value.(4)The single-scale and multi-scale correlations of the components of corn plant height and corn ear mass at different growth stages showed a gradual increase;the degree of correlation between stem diameter and corn ear mass components at a single scale gradually increased with the growth period and The degree of multi-scale correlation showed the first increase and then decrease;corn chlorophyll content and leaf area and corn ear quality components of a single scale and multiscale correlation degree showed a first increase and then decrease.The multi-scale correlations between the quality components of corn ear and chlorophyll content and the leaf area from the grain filling stage to the ripe stage were reduced,The multi-scale correlations between the quality components of corn ear and crop information in other fertility stages were significantly greater than those on a single scale. |
