Dualex便攜式智能氣象-葉綠素-花青素-黃酮醇測量儀

摘要

準確估計和及時診斷作物氮素狀況有助于季節(jié)施肥管理。為了評估三個葉片和冠層光學傳感器在無損診斷冬小麥氮素狀況方面的性能，使用七個小麥品種和多種氮素處理（0–360 kg N ha?1）進行了三個試驗，于2015年至2018年在中國江蘇省進行。在主要生長期，分別使用兩個葉片傳感器（SPAD 502，Dualex 4 Scientific+）和一個冠層傳感器（RapidSCAN CS-45）獲取葉片和冠層光譜數(shù)據(jù)。同時測定了葉片氮濃度（LNC）、葉片氮積累（LNA）、植株氮濃度（PNC）、植株氮積累（PNA）和氮素營養(yǎng)指數(shù)（NNI）五個氮素指標。在每個生長階段，建立了六個基于傳感器的指數(shù)（葉片水平：SPAD、Chl、Flav、NBI、冠層水平：NDRE、NDVI）與五個N參數(shù)之間的關系。結(jié)果表明，基于Dualex的NBI在四個葉傳感器指標中表現(xiàn)相對較好，而RS傳感器的NDRE在不同生長階段的五個N指標估計中，由于冠層傳感器的采樣面積較大，因此表現(xiàn)最好。NNI診斷模型的面積一致性范圍為SPAD為0.54至0.71，NBI為0.66至0.84，NDRE為0.72至0.86，SPAD為0.30至0.52，NBI為0.42至0.72，NDRE為0.53至0.75。總的來說，這些結(jié)果揭示了基于傳感器的診斷模型在快速、無損診斷N狀態(tài)方面的潛力。

關鍵詞：氮指示劑；氮營養(yǎng)診斷；光學傳感器；光譜指數(shù)

Evaluation of Three Portable Optical Sensors for Non-Destructive Diagnosis of Nitrogen Status in Winter Wheat

Abstract

The accurate estimation and timely diagnosis of crop nitrogen (N) status can facilitate in-season fertilizer management. In order to evaluate the performance of three leaf and canopy optical sensors in non-destructively diagnosing winter wheat N status, three experiments using seven wheat c*rs and multi-N-treatments (0–360 kg N ha?1) were conducted in the Jiangsu province of China from 2015 to 2018. Two leaf sensors (SPAD 502, Dualex 4 Scientific+) and one canopy sensor (RapidSCAN CS-45) were used to obtain leaf and canopy spectral data, respectively, during the main growth period. Five N indicators (leaf N concentration (LNC), leaf N accumulation (LNA), plant N concentration (PNC), plant N accumulation (PNA), and N nutrition index (NNI)) were measured synchronously. The relationships between the six sensor-based indices (leaf level: SPAD, Chl, Flav, NBI, canopy level: NDRE, NDVI) and five N parameters were established at each growth stages. The results showed that the Dualex-based NBI performed relatively well among four leaf-sensor indices, while NDRE of RS sensor achieved a best performance due to larger sampling area of canopy sensor for five N indicators estimation across different growth stages. The areal agreement of the NNI diagnosis models ranged from 0.54 to 0.71 for SPAD, 0.66 to 0.84 for NBI, and 0.72 to 0.86 for NDRE, and the kappa coefficient ranged from 0.30 to 0.52 for SPAD, 0.42 to 0.72 for NBI, and 0.53 to 0.75 for NDRE across all growth stages. Overall, these results reveal the potential of sensor-based diagnosis models for the rapid and non-destructive diagnosis of N status.  

Keywords: nitrogen indicator; nitrogen nutrition diagnosis; optical sensor; spectral index 

相關閱讀

Dualex 便攜式智能氣象-葉綠素-花青素-黃酮醇測量儀

PESSL便攜式便攜式植物多酚-葉綠素儀原理

Dualex植物多酚-葉綠素儀：腐殖酸通過鐵依賴和非鐵依賴的協(xié)同機制緩解禾本科植物的鐵失綠癥

Dualex植物多酚-葉綠素儀：硝化抑制劑和/或間作效應下玉米（和小麥灌溉種植系統(tǒng)中的硝酸鹽淋失

Dualex植物多酚-葉綠素儀：與保持綠色表達相關的葉片和冠層性狀與對水分脅迫具有不同耐性的小麥基因型的產(chǎn)量構成密切相關

Dualex植物多酚-葉綠素儀：基于地面和智能傳感器的冬小麥營養(yǎng)營養(yǎng)儀

Dualex植物多酚-葉綠素儀：增加角質(zhì)層蠟沉積不會改變殘余葉片蒸騰作用

Dualex植物多酚-葉綠素儀--氮平衡指數(shù)：不同生物刺激劑對水培生菜的效果比較

Dualex植物多酚-葉綠素儀：固體消化物和葡萄園冬季修剪堆肥替代苗圃中微繁殖高叢藍莓生長基質(zhì)中的泥炭研究

Dualex植物多酚-葉綠素儀：不同灌溉制度下根際細菌和藻類對金盞草生理生化指標的影響

Dualex植物多酚-葉綠素儀：Sentinel-2A與近端傳感器數(shù)據(jù)協(xié)同提取水稻不同生育期生化參數(shù)