植物多酚葉綠素儀在評(píng)價(jià)板坯甜椒氮素狀況和產(chǎn)量中的應(yīng)用

Dualex便攜式智能氣象-葉綠素-花青素-黃酮醇測(cè)量?jī)x
 

摘氮（N）是一種經(jīng)常與環(huán)境問(wèn)題有關(guān)的基本元素，利用葉夾傳感器來(lái)調(diào)節(jié)N施肥是一項(xiàng)令人感興趣的技術(shù)。本研究旨在評(píng)估在不同氮?jiǎng)┝肯路N植的甜椒作物周期中，SPAD和Dualex測(cè)量的指標(biāo)，確定SPAD和Dualex光學(xué)傳感器評(píng)估氮狀況的能力，并確定葉綠素指數(shù)作為產(chǎn)量估計(jì)器的準(zhǔn)確性。甜椒植株移栽（DAT）后在平板上培養(yǎng)150天，施肥6種不同的N劑量，分為10次，每?jī)芍苁┯靡淮�。在每個(gè)處理的最上部成熟葉片上，在整個(gè)周期內(nèi)測(cè)量SPAD、葉綠素（CHL）、類黃酮（FLV）和氮平衡指數(shù)（NBI）。我們測(cè)定了這些葉片的氮含量和最終的商業(yè)產(chǎn)量。氮?jiǎng)┝颗c生長(zhǎng)期之間存在交互作用。高達(dá)60dat的氮?jiǎng)┝繉?duì)SPAD和CHL指數(shù)沒(méi)有顯著影響。FLV和NBI指數(shù)對(duì)N劑量的反應(yīng)顯示出相反的模式。我們發(fā)現(xiàn)SPAD、CHL和NBI與葉片中的氮含量以及這些指標(biāo)與幾個(gè)評(píng)估日期的商業(yè)產(chǎn)量之間存在很強(qiáng)的相關(guān)性。然而，我們沒(méi)有觀察到商業(yè)產(chǎn)量和FLV之間的顯著相關(guān)性。這兩種葉夾傳感器都可以預(yù)測(cè)葉片的氮素狀況和商業(yè)產(chǎn)量，隨著作物發(fā)育的進(jìn)行，這種相關(guān)性得到改善。

Application of Proximal Optical Sensors to Assess Nitrogen Status and Yield of Bell Pepper Grown in Slab
 

Abstract

Nitrogen (N) is an essential element frequently associated with environmental issues, and the utilization of leaf clip sensors to adjust N fertilization is a technology of interest. This study aimed to evaluate the indices measured with SPAD and Dualex through the bell pepper crop cycle cultivated under different N doses, to identify the ability of the SPAD and Dualex optical sensors to assess N status and establishing the accuracy of the chlorophyll indices as yield estimators. Bell pepper plants were cultivated for 150 days after transplanting (DAT) in slabs fertigated with 6 different N doses divided into 10 bi-weekly applications. The indices SPAD, chlorophyll (CHL), flavonoids (FLV), and nitrogen balance index (NBI) were measured over the cycle on the uppermost mature leaves of each treatment. We determined the N content of these leaves and the final commercial yield. An interaction effect was found between N dose and growth stage. The SPAD and CHL indices were not significantly affected by N dose up to 60 DAT. The FLV and NBI indices show an opposite pattern in response to N dose. We found a strong correlation between the SPAD, CHL, and NBI and the N content in the leaves and between these indices and commercial yield in several evaluated dates. However, we did not observe a significant correlation between commercial yield and FLV. Both leaf clip sensors could predict the N status of the leaves and the commercial yield, improving the correlation as the crop development progressed.