Hongmei Zhuang¹ , Pan Li² , Huifang Liu¹ , Pengfei Lu³ , Guangping Feng² , Hongwei Han¹ , Qiang Wang¹ , Hao Wang¹

1 Institute of Horticultural Crops, Xinjiang Academy of Agricultural Sciences, Urumqi, 830091, China
2 Institute of Soil Fertilizer and Agricultural Water Conservation, Xinjiang Academy of Agricultural Sciences, Urumqi, 830091, China
3 College of Forestry and Horticulture, Xinjiang Agricultural University, Urumqi, 830052, China
Author    Correspondence author
International Journal of Horticulture, 2023, Vol. 13, No. 8   doi: 10.5376/ijh.2023.13.0008
Received: 28 May, 2023    Accepted: 05 Jun., 2023    Published: 15 Jun., 2023

This article was first published in Molecular Plant Breeding in Chinese, and here was authorized to translate and publish the paper in English under the terms of Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Zhuang H.M., Li P., Liu H.F., Lu P.F., Feng G.P., Han H.W., Wang Q., and Wang H., 2023, Effects of chemical fertilizer reduction on leaf spectral characteristics of greenhouse Long pepper, International Journal of Horticulture, 13(8): 1-17 (doi: 10.5376/ijh.2023.13.0008)

The sensitive period of leaf spectral index was studied by analyzing the leaf spectral reflectance in the response to nitrogen, phosphorus and potassium fertilizer at different growing stages of greenhouse Long pepper under the condition of fertilizer application reduction, to provide a non-invasive, simple and rapid nutrition diagnosis of nitrogen, phosphorus and potassium. The leaf spectral reflectance was measured using Unispec-SC spectrometer at initial flowering, initial fruiting, green ripening, color changing, red ripening stage of pepper leaves under the condition of different nitrogen, phosphorus and potassium fertilizer levels. The variation of leaf spectral reflectance in developmental phase was the least in visible spectrum band. In the near infrared region, the leaves of pepper showed lower spectral reflectance and higher chlorophyll content in different fruit growth stages, optimized fertilization treatment with a reduction of 30% and optimized fertilization treatment with a reduction of 45%. Under different nitrogen, phosphorus and potassium fertilization levels, the sensitive bands of nitrogen, phosphorus and potassium in leaves at different fruit development stages were different. Under different fertilizer treatment conditions, nitrogen, phosphorus and potassium of leaves had different light sensitive bands at different developmental stages. The sensitivity differences of leaf spectral reflectance to N, P and K in different growth stages of greenhouse Long pepper were analyzed, and the sensitive periods of N, P and K were explored by using leaf spectral index, aiming to provide the best time window for rapid, accurate and non-destructive nutritional diagnosis of greenhouse Long pepper.

Long pepper; Fertilizer reduction; Spectral reflectance; Developmental phase; Sensitive period