LAI Portable Analyzer MIJ-15LAI/P

LAI analyzer MIJ-15 LAI/P: Gives you absolute LAI value

Feature

  • The world's only sensor that adopted the relationship that the spectral ratio of PAR and IR correlates with LAI.
  • Regardless of cloudy weather, fine weather, instantaneous LAI measurement on the spot has been completed.
  • Capable of Exact LAI measurement: counting only live leaves.
  • No PAI (Plant Area Index) counting so avoiding influences from dead leaves, branches, trunks remain.
  • Portable
  • Another choice /K2 stands for fixed – point observation

Introduction

Measurements of Leaf Area Index (LAI) divided into two types direct and estimating measurements. 
Measuring by Reaping or  leaf litter trap is the direct measurement. 
By estimating leaf volume and light decay based on optical estimation by using hemispherical photograph is the estimating measurement.

Disadvantage of major Plant Canopy analyzer 

1.
To see the LAI results, we will need to have two plant Canopy analyzers; this is because LAI result  must need to compare the transmission of light ratio both inside and outside canopy at the same time.  This means, it is depending on the absolute value of inside and outside light; thus the at least two instruments need to set at inside and outside.

2.
There is no stable atmosphere condition so researchers must care solar radiation intensity every single test. In fact, solar radiation intensity is mostly stable at cloudy weather but do you want to choose cloudy weather for field experiments? Even though solar radiation intensity is stable at cloudy weather condition, you still need to care the sun height, to gain the good LAI results. To do so  instruments need to place at same sun height. But can you keep setting at same height?  

3.
Do you know Plant Area Index (PAI) influencing LAI results? 
This is because general LAI sensor involve branch and dead leaves these elements cannot called leaf but major LAI meter ignoring  the fact that these obstacles messing LAI results so it is impossible to correct exact LAI value.

MIJ-15LAI Sensors

To avoid above mentioned troublesome, MIJ-15LAI/P and MIJ-15LAI Type2/K2 will be able to let researcher to determine quantity of LAI by measuring the spectral ratio of sunlight transmitted through plant canopy.
How?
We used the measurement by spectroscopy.
(Patented NO.JP5410323B22014.2.5)
PAR(400-700nm) and NIR(700-1000nm) will be reflect and absorption occur at chlorophyll inside leaf so the transmitted light ratio is correlated with LAI.
MIJ-15 LAI/P and MIJ-15LAI Type II/K2 gives numerous hopes for the feature research.
You do not need to think about weather condition and LAI and PAR can be measured  just set under the canopy or leaf. Also you only need to have one MIJ-15LAI Type II/P so price will be reasonable compare to other LAI instruments and it is portable so you can measure easily or traditionally set it under canopy; LAI annual change can be measured with data logger .

Specification

Display 1. LAI, 2. NIR, 3. PAR, 4. Battery voltage 
Regression eq.  LAI=2.80In(NIR/PAR)+0.69
Unit NIR and PAR / uE (μmol∝S-1∝m-2)LAI / Dimensionless
Operating Temperature -25 to 60 Degree 
Data storage 125,000 data 
Battery 4AA
Shape Sensor :126(W), 49(H), 60(D)  (W/O Gun grip) 
Logger80(W), 189(H), 35(D) 
Cable length Around 1.5m
Weight 1250 grams, 3500grams (Full package) 

Reference for MIJ-15LAI series (written in English or Japanese)

放棄二次林におけるアズマネザサの刈り取りが草本層植物の生長・着花・結実に及ぼす影響
光合成有効放射と近赤外放射の透過光の比と水稲の生育指標の相関
アズマネザサの刈り取りが放棄二次林の林床植生に与える影響
LED Lighting for Urban Agriculture 2016/11/17 (本にて出版)
名古屋大学 2020 3月 プレスリリース
Novel technique for non-destructive LAI estimation by continuous  measurement of NIR and PAR in rice canopy – ScienceDirect
2008年度 九州大学森林生態圏管理学講座(演習林) 研究発表会 プログラム
NIR・PAR の連続測定による生育期間を通じたイネ群落 LAI の非破壊計測法の開発
Evaluation of Spatial Light Environment and Plant Canopy Structure
Distributions of photosynthetic traits, shoot growth, and anti-herbivory defence within a canopy of Quercus serrata in different soil nutrient conditions
Correlation Network Analysis Visually Identifies Interactions of Antioxidant Compounds with Plant Growth, Leaf Photosynthetic Performance, and Agronomic Quality in Strawberry
冷温帯落葉広葉樹林におけるLAI季節変化 Seasonal variation in LAI from a cool-temperate deciduous broadleaved forest
Howdorubber(Heveabrasiliensis)plantationsbehaveunderseasonalwaterstressinnortheasternThailandandcentralCambodia?
The ratio of transmitted near-infrared radiation to photosynthetically active radiation (PAR) increases in proportion to the adsorbed PAR in the canopy
近赤外光光合成有効放射比の連続測定によるイネ群落の非破壊 LAI 計測法の開発
非破壊的LAI計測法を応用したイネ群落成長の微気象応答のインディカ・ジャポニカ品種間差,地域間差の解明
新型LAIセンサーMIJ-15開発 日本農業気象学会全国大会講演要旨/Proceedings of International Symposium on Agricultural Meteorology (日本農業気象学会全国大会講演要旨/Proceedings of ISAM)
Adaptive frequency scaled wavelet packet decomposition for frog call classification
日本農業気象学会全国大会講演要旨/Proceedings of International Symposium on Agricultural Meteorology  (日本農業気象学会全国大会講演要旨/Proceedings of ISAM)
A Special Relationship between Canopy and Understory Leaf Area Index in an Old-Growth Cool-Temperate Deciduous Forest