不同施肥处理花生反射光谱与产量相关性研究

Study on Correlation Between Yield and Reflectance Spectrum of Peanut Treated with Different Fertilization

了解不同施肥条件下花生叶片光谱反射率与产量的相互关系,设计包含7种施肥处理、3次重复的田间试验,在主要生育期测定叶片光谱反射率和功能叶叶绿素的相对含量。结果表明,随生育期推进不同施肥处理叶片SPAD值呈现相似的先升后降的变化趋势;不同施肥条件花生叶片的光谱曲线相似,但不同波段光谱反射率大小存在一定程度的差异;"低肥+钙肥+锌肥+根瘤菌"施肥处理产量高于其他施肥处理,其中钙肥增产效果明显;开花下针期、结荚期、饱果成熟期花生叶片光谱与产量相关性较好,其中在结荚期花生叶片光谱与产量相关性最好。花生叶片光谱特征波段与产量之间具有较密切的关系,可利用叶片光谱反射率监测花生营养状况。

Field trial with 7 fertilization treatments and 3 replications were designed to clarify the relationship between leaf spectral reflectance and yield of peanut under different fertilization condi-tions,and provide scientific basis for nutritional diagnosis and yield estimation of peanut by using spectrum monitoring technology.Spectral reflectance was measured by the ASD portable ground ob-ject spectrometer during the main growth period,and the relative green content of functional leaves was measured with SPAD502 plus.The SPAD values of the leaves under different fertilization treat-ments showed a similar general trend of first rising and then falling with the advancement of growth period.The spectral curves of peanut leaves at different fertilization conditions and different growth stages were similar,but the spectral reflectance of different bands was different.The yield of"low fer-tilizer+calcium fertilizer+zinc fertilizer+rhizobia"fertilizer treatment was higher than that of other ferti-lization treatments,in which calcium fertilizer had obvious effect on yield increase.The correlation between leaf spectra and yield of peanut was good at flowering and lower pinching stage,pod bearing stage and full fruit ripening stage,among which the correlation between leaf spectra and yield of peanut was the best at pod bearing stage.There is a close relationship between characteristic spectral bands and yield,the leaf spectral reflectance can be used to monitor the nutritional status of peanut.