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)

精品久久久久久无码中文野结衣 | 他揉捏她两乳不停呻吟A片| 五十路熟女人妻一区二区| 亚洲AV无码乱码在线观看富二代| 国产精品久久久久影院老司| 97夜夜澡人人双人人人喊 | 免费看曰批女人爽的视频| 国语自产偷拍精品视频偷| 久久AV色欲AV久久蜜桃麻豆| 下一轮油价调整预测| 外国四个黑人RAPPER组合 | 无人在线观看高清完整免费| 边做奶水边喷H高H共妻| 人妻少妇精品专区性色AV| 在厨房被C到高潮A毛片奶水| 天天夜夜草草久久伊人69堂| 无码国内精品人妻少妇| 亚洲精品久久久无码| 99久久国产精品免费一区二区| 中文无码精品一区二区三区| 国内少妇偷人精品视频免费| 成年美女黄网站色大免费视频| 又大又紧又粉嫩18P少妇| 怀孕被躁到高潮的孕妇| 又大又粗欧美黑人AAAAA片| 99香蕉国产精品偷在线观看| 我把五十老女人弄高潮了| 被滋润的娇妻疯狂呻吟| 天天摸夜夜摸摸到高潮| AV小四郎收藏家| 国产精品麻豆VA在线播放| 国产成人无码一区二区三区在线| 日韩精品无码一本二本三本色| 小雪第一次交换又粗又大老杨| 国产丝袜视频一区二区三区 | 高潮娇喘抽搐A片无码黄| 国产一二三精品无码不卡日本 | 精品久久久久久无码中文野结衣| 色噜噜久久综合伊人超碰| AV色综合久久天堂AV色综合在| 国产精品毛片一区二区三区|