色戒电影未删减完整版免费观看,国产精品永久久久久久久久久,欧美日本免费一区二区三区,护士表妺好紧竟然流水视频

網(wǎng)站首頁(yè)技術(shù)中心 > 利用Dualex植物葉綠素儀對(duì)冬小麥氮素進(jìn)行估算
產(chǎn)品中心

Product center

利用Dualex植物葉綠素儀對(duì)冬小麥氮素進(jìn)行估算

更新時(shí)間:2022-05-06 點(diǎn)擊量:1251

1649384229537377.png

Dualex便攜式氮平衡-葉綠素-花青素-黃酮醇測(cè)量?jī)x

摘要

更好地了解小麥氮素狀況對(duì)于改善精準(zhǔn)農(nóng)業(yè)中的氮肥管理非常重要。在這項(xiàng)研究中,評(píng)估了四種不同傳感器估算冬小麥氮素的能力。采用高斯過(guò)程回歸(GPR)方法和順序向后特征去除(SBBR)程序,確定了不同傳感器對(duì)小麥氮素指標(biāo)敏感的植被指數(shù)(VIs)的最佳組合。通過(guò)參數(shù)回歸(PR)、多變量線(xiàn)性回歸(MLR)和高斯過(guò)程回歸(GPR),利用VIs估計(jì)小麥葉片氮濃度(LNC)、植株氮濃度(PNC)和營(yíng)養(yǎng)指數(shù)(NNI)。研究結(jié)果表明,在低冠層覆蓋條件下,光學(xué)熒光傳感器可以更準(zhǔn)確地估計(jì)冬小麥氮素狀況。雙氮平衡指數(shù)(NBI)是小麥生長(zhǎng)早期LNC、PNC和NNI的最佳葉片水平指標(biāo)。在生長(zhǎng)早期,復(fù)合指數(shù)是LNC、PNC和NNI的最佳冠層水平指標(biāo)。在生長(zhǎng)后期,ASD-VIs為小麥氮素指標(biāo)提供了準(zhǔn)確的估計(jì)。這項(xiàng)研究還表明,與MLR和PR方法相比,GPR結(jié)合SBBR分析方法可以更準(zhǔn)確地估計(jì)冬小麥LNC、PNC和NNI,并為這些傳感器在不同冬小麥生長(zhǎng)階段提供最佳VI組合。

關(guān)鍵詞:葉片氮濃度;植物含氮量;氮素營(yíng)養(yǎng)指數(shù);高斯過(guò)程回歸

Winter Wheat Nitrogen Estimation Based on Ground-Level and UAV-Mounted Sensors

Abstract

A better understanding of wheat nitrogen status is important for improving N fertilizer management in precision farming. In this study, four different sensors were evaluated for their ability to estimate winter wheat nitrogen. A Gaussian process regression (GPR) method with the sequential backward feature removal (SBBR) routine was used to identify the best combinations of vegetation indices (VIs) sensitive to wheat N indicators for different sensors. Wheat leaf N concentration (LNC), plant N concentration (PNC), and the nutrition index (NNI) were estimated by the VIs through parametric regression (PR), m*riable linear regression (MLR), and Gaussian process regression (GPR). The study results reveal that the optical fluorescence sensor provides more accurate estimates of winter wheat N status at a low-canopy coverage condition. The Dualex Nitrogen Balance Index (NBI) is the best leaf-level indicator for wheat LNC, PNC and NNI at the early wheat growth stage. At the early growth stage, Multiplex indices are the best canopy-level indicators for LNC, PNC, and NNI. At the late growth stage, ASD VIs provide accurate estimates for wheat N indicators. This study also reveals that the GPR with SBBR analysis method provides more accurate estimates of winter wheat LNC, PNC, and NNI, with the best VI combinations for these sensors across the different winter wheat growth stages, compared with the MLR and PR methods.  

Keywords: leaf nitrogen concentration; plant nitrogen content; nitrogen nutrition index; Gaussian process regression

相關(guān)閱讀

Dualex便攜式氮平衡-葉綠素-花青素-黃酮醇測(cè)量?jī)x

PESSL便攜式Dualex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(guò)鐵依賴(lài)和非鐵依賴(lài)的協(xié)同機(jī)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(yīng)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(dá)相關(guān)的葉片和冠層性狀與對(duì)水分脅迫具有不同耐性的小麥基因型的產(chǎn)量構(gòu)成密切相關(guān)

久久久AV精品波多野结衣| 女人被弄到高潮的免费视频| 女友的妺妺6中文字幕| 一区二三国产好的精华液| 精品久久久久久中文字幕大豆网| 成人欧美尽粗二区三区AV| 亚洲和欧洲一码二码区别在| 欧美午夜精品久久久久久浪潮| 婷婷亚洲五月色综合久久| 呦VODAFONEWIFI高清| 亚洲精品无码久久久久| 成人区人妻精品一区二区不卡网站 | 邻居少妇张开双腿让我爽一夜| 最近2019中文字幕大全视频1| 国产美女在线精品免费观看网址| 久久久国产精品免费A片分环卫 | 特级毛片A级毛片免费观看网站| 亚洲av无码专区在线播放中文| 国产精品人妻一码二码| 中文乱码字慕人妻熟女人妻| 国产精品一国产精品| 亚洲区色情区激情区小说| 诱人的大乳BD在线观看| 成人欧美一区二区三区黑人| 欧美视频在线| 久久久久久精品天堂无码中文字幕| 色噜噜狠狠色综合日日| 国产AAAA片在线观看| 精品免费囯产一区二区三区四区| 久久久久久久| 交换俱乐部娇妻奶呻吟啊视频| 丰满饥渴老女人HD| 日韩A片无码毛片免费看| 欧美乱妇无乱码大黄A片| 国产精品国产三级国产a| 国产真实伦对白全集| 男朋友整根进去了但我没感觉| 国产又色又爽又高潮免费| 欧美日韩视费观看视频| 9孩岁女精品╳片| 无码人妻丰满熟妇精品区|