Evaluating the impacts of nitrogen on the growth stages of cucumber

Document Type : Research Paper

Author

Department of Biosystems Engineering, Bu-ali Sina University, Hamadan, I. R. Iran

Abstract

Monitoring physiological parameters of plant and fertilizer requirements are the basic principles in precision farming. Non-destructive and accurate remote sensors make this process feasible and light-handed. The present study evaluates the efficiency of GreenSeeker (GS) and Soil-Plant Analyses Development (SPAD) in Nitrogen (N) fertilizer management. Normalized difference vegetation index (NDVI) was measured with GS and compared to SPAD. Fertigation with 5 different N treatments was applied to 100 pots. The first treatment (N1) had no N concentration, while the other treatments (i.e., N2, N3, N4, and N5) received 2, 9, 22, and 37 mmol.L-1 weekly, respectively. Next, the effect of volumetric fertilizing was investigated by adding supplemental fertilizer to N1 to N3 pots 71 days after planting. Nitrogen concentration in the leaf and first growing fruit was tested using the Kjeldahl method. The results of applied sensors confirmed with visible-near infrared spectroscopy at 200-1100 nm wavelength. NDVI, soil-adjusted vegetation index, and chlorophyll index were calculated from the available spectra and compared to the sensor outputs. Strong correlations were obtained between NDVI and all indices derived from spectra, especially in the vegetative phase. The results showed a strong correlation of NDVI with N rate, especially after supplemental fertilizing. Since the vegetation indices from spectra almost correlated well with NDVI and SPAD in all treatments, spectroscopy monitoring of cucumber could be a precise alternative technique. Linear and nonlinear regressions were applied to model variations of NDVI and SPAD. This study demonstrated the feasibility of using GS for N management according to its sensitivity to cucumber N status.

Keywords

Main Subjects

Article Title [Persian]

ارزیابی اثرات نیتروژن بر مراحل رشد خیار

Author [Persian]

  • بهنام سپهر
گروه مهندسی بیوسیستم، دانشگاه بوعلی سینا، همدان، ج. ا. ایران
Abstract [Persian]

بررسی پارامترهای فیزیولوژیکی گیاه و کود موردنیاز از اصول اساسی در کشاورزی دقیق است. سنسورهای غیر مخرب و دقیق از راه دور این فرآیند را امکان‌پذیر می‌کنند. مطالعه حاضر کارایی دو دستگاه GreenSeeker (GS) و توسعه تجزیه‌وتحلیل خاک-گیاه (SPAD) Soil-Plant Analysis Development را در مدیریت کود نیتروژن (N) ارزیابی می‌کند. شاخص نرمال شده تفاوت گیاهی (NDVI) با GS اندازه‌گیری و با SPAD مقایسه شد. کود دهی با 5 تیمار مختلف نیتروژن در 100 گلدان اعمال شد. تیمار اول (N1) غلظت نیتروژن نداشت، درحالی‌که تیمارهای دیگر (یعنی N2، N3، N4 و N5) به ترتیب 2، 9، 22 و 37 میلی مول در لیتر در هر هفته دریافت کردند. سپس اثر کود دهی حجمی با افزودن کود مکمل به گلدان‌های N1 تا N3، 71 روز پس از کاشت بررسی شد. غلظت نیتروژن در برگ و میوه در حال رشد با استفاده از روش کجلدال مورد آزمایش قرار گرفت. نتایج حسگرهای اعمال‌شده با طیف‌سنجی مادون‌قرمز در طول‌موج 200-1100 نانومتر تأیید شد. NDVI، شاخص پوشش گیاهی با خاک و شاخص کلروفیل از طیف‌های موجود محاسبه و با خروجی‌های حسگر مقایسه شد. همبستگی قوی بین NDVI و تمام شاخص‌های مشتق شده از طیف، به‌خصوص در فاز رویشی به دست آمد. نتایج، همبستگی قوی NDVI با میزان نیتروژن، به‌ویژه پس از کود دهی تکمیلی را نشان داد. ازآنجایی‌که شاخص‌های پوشش گیاهی از طیف تقریباً به‌خوبی با NDVI و SPAD در تمام تیمارها همبستگی دارند، نظارت طیف‌سنجی از راه دور خیار می‌تواند یک تکنیک جایگزین دقیق­تر باشد. رگرسیون خطی و غیرخطی برای تغییرات مدل NDVI و SPAD اعمال شد. این مطالعه امکان استفاده از GS را برای مدیریت N با توجه به حساسیت آن به وضعیت نیتروژن خیار نشان داد.

Keywords [Persian]

  • خیار
  • شاخص پوشش گیاهی
  • GreenSeeker
  • نیتروژن
  • SPAD

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Iran Agricultural Research
Volume 42, Issue 2
November 2023
Pages 74-83

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