1-naphthaleneacetic acid · Yield · Solanum lycopersicum (tomato)

Results differ23 papers: 21 positive, 2 negative or no effect · 1 pair of papers confirmed to differ

41 claims from these papers; 2 citations between them.

Papers whose results differ, checked claim by claim 1

1 pair of papers on this question report results that differ: an effect in one paper, the opposite effect or no effect in the other. Two model reviewers reading both claims accepted each pair.

Optimal Use of Plant Growth Regulators for Improved Growth, Yield, and Economic Returns of Winter Tomato (Solanum lycopersicum) in arid regions (2024)
increaseNAA significantly increased fruit yield and economic returns.
Substitution of Chemical Fertilization using PGRs Evident in Growth and Yield of Tomato (2024)
decreaseNAA decreased tomato vegetative and reproductive traits including yield.
What separates themTest system: field · controlled environmentCompare the two papers →

How these papers cite each other

2 citations between these papers: 1 on the same side, 1 across the two sides.

Positive result
Negative result or no effect
Citation, pointing to the cited paper
Citation across the two sides
Larger circle: more citations overall

Years run left to right. Citations come from the papers’ OpenAlex reference lists. Hover a paper to bring forward its citations; click it to open the paper.

Papers reporting a positive result 21

Studies on the coloration of tomato fruit · 1961
- positive
  PCPA, NAA and 2, 4-D sprays increased early tomato yield.
Effect of Plant Growth Regulator on Root Activity of Tomato in Long-term Soilless Cultivation · 2007
- positive
  CSN + NAA increased tomato yield by 8.78% compared with control.
  compared with the control
Influence of Taraxacum officinale Wigy and Malva parvifloral L. on the active ingredient of tomato in vitro · 2012
- positive
  NAA at 1 mg/l with BA at 2 mg/l produced the highest callus quantity.
EFFECTS OF NAPHTHALENE ACETIC ACID AND CALCIUM CHLORIDE APPLICATION ON NUTRIENT UPTAKE, GROWTH, YIELD AND POST HARVEST PERFORMANCE OF TOMATO FRUIT · 2013
- positive
  Higher CaCl2 (1%) with NAA (0.02%) increased plant growth and yield by improving mineral uptake.
Use of Plant Growth Regulators in Tomato (Solanum lycopersicum L.) under Tarai Conditions of Uttarkhand · 2014
- positive
  NAA 40ppm increased fruits per plant.
Effect of Different Levels of NAA, GA₃and 2, 4-D on Growth and Yield of Tomato(Lycopersicon EsculentumMill.) · 2016
- positive
  The specified GA3, NAA and 2, 4-D combination significantly increased total tomato yield to 523 q/h.
Effect of Naphthalene Acetic Acid (NAA) and Gibberellic Acid (GA3) on Growth and Fruit Quality of Tomato (Lycopersicon esculentum Mill.) · 2018
- positive
  Increasing NAA significantly improved tomato fruit number, with the maximum at 100 ppm.
- positive
  Increasing NAA significantly improved tomato fruit weight, with the maximum at 100 ppm.
- positive
  NAA significantly increased tomato branch number, with the maximum at 100 ppm.
cited by 1 paper here
Effect of Plant Growth Regulator on Growth, Yield & Quality of Tomato (Solanum lycopericum) Cultivar ‘Shivaji’ under Punjab Condition · 2018
- positive
  Growth, phenological and yield parameters of tomato were significantly superior at different GA3, NAA and kinetin concentrations compared with the control.
  compared with control treatment
cited by 1 paper here
Effect of NAA, GA3 on growth and yield of tomato varieties · 2018
- positive
  15 ppm GA3 followed by 25 ppm NAA improved tomato growth and yield.
Role of Foliar Applications by some Safety Compounds and Shading in Alleviating the Harmful Impacts of High Temperature on Tomato · 2019
- positive
  NAA at 2.5 ppm gave the greatest number of branches per tomato plant over the two seasons.
- positive
  NAA significantly increased fruit set of the Alissa F1 tomato by 8.83 % over the control.
  compared with control
- positive
  NAA significantly increased fruit set of the 888 hybrid tomato by 13.10 % over the control.
  compared with control
Effect of Foliar Spray with Some Growth Stimulants on Growth and Productivity of Some Varieties of Tomato Grown In the Late Summer Seasons · 2021
- positive
  Hybrid Thoeria 0.84 sprayed with NAA at 200ppm had the highest measured fruit yield.
Effect of GA3 and NAA on tomato production under protected cultivation in Kaski, Nepal · 2022
- positive
  NAA at 25 ppm increased tomato yield by 10.37% over NAA at 0 ppm.
  compared with NAA @ 0 ppm
- positive
  NAA at 25 ppm increased tomato yield by 17.47% over NAA at 50 ppm.
  compared with NAA @ 50 ppm
- positive
  NAA at 25 ppm increased tomato yield by 24.78% over NAA at 75 ppm.
  compared with NAA @ 75 ppm
- positive
  NAA at 25 ppm gave the highest tomato yield (109.91 metric ton/ha) among the four NAA levels.
  compared with NAA @ 0 ppm, NAA @ 50 ppm and NAA @ 75 ppm
cites 1 paper here
Value-added organic fertilizer with salicylic acid and naphthyl acetic acid improves the tomato quality and productivity in saline-sodic conditions · 2023
- positive
  Combined NAA and SA in organic fertilizer produced maximum tomato yield.
Effect of Plant Growth Regulators on the Growth, Yield and Quality of Tomato (Solanum lycopersicum L.) · 2023
- positive
  T18 gave the best number of fruits per plant, 17.27.
- positive
  T18 gave the best total yield per plant, 5.84 kg.
- positive
  T18 gave the best days to first harvest, 85.63 DAT.
- positive
  T18 gave the best fruit yield per hectare, 216.3 t.
- positive
  T18 gave the best average fruit yield per plant, 1.95 kg.
- positive
  T18 gave the best fruit set per cluster, 8.07.
- positive
  T18 gave the best individual fruit weight, 112.63 g.
Effect of Plant Growth Regulator (GA3 and NAA) on Growth, Yield and Quality of Tomato (Solanum lycopersicum L.) · 2023
- positive
  Increased NAA and GA3 significantly improved tomato growth and yield.
Optimal Use of Plant Growth Regulators for Improved Growth, Yield, and Economic Returns of Winter Tomato (Solanum lycopersicum) in arid regions · 2024
- positive
  NAA significantly increased plant height and branch number.
- positive
  NAA significantly increased fruit yield and economic returns.
Effect of NAA and GA3 on quality and fruit yield of Tomato (Solanum lycopersicum Mill.) · 2024
- positive
  Fruit yield per hectare of tomato under NAA at 20 ppm and GA3 at 90 ppm reached 99.62 tons, significantly higher than the control and other treatments.
  compared with control and other treatments
- negative
  Lower levels of NAA and GA3, or their absence, gave comparatively lower tomato fruit yield.
Effect of PGRs on growth, reproductive efficiency, and quality of tomato (Solanum lycopersicum) in arid regions · 2024
- positive
  NAA@75 ppm produced number of flowers of 5.4/cluster in tomato.
- positive
  NAA@75 ppm produced number of fruits of 3.2/cluster in tomato.
- positive
  NAA@75 ppm produced number of fruits of 38.1/plant in tomato.
- positive
  NAA@75 ppm produced fruit weight of 84.3 g in tomato.
Effect of micronutrients and PGRs on growth and yield of Tomato (Solanum lycopersicum L.) cv. Azad-T6 · 2024
- positive
  Micronutrients and growth regulators enhanced vegetative growth, flowering and yield.
Optimising Seed Quality of Tomato with Naphthyl Acetic Acid (NAA) Foliar Spray and Training System · 2025
- positive
  Spraying tomato plants with 50 ppm NAA with two-stem retention increased 1000-seed weight to 3.52 g.
Optimizing Tomato Yield through Bioregulator Application for Flower and Fruit Drop Reduction in the North Agroclimatic Zone of Bihar · 2025
- positive
  NAA at 30 ppm produced maximum plant height, branch number and leaf number.
  compared with GA 3 @100 ppm

Papers reporting a negative result or no effect 2

Interactive plant growth regulator and fertilizer application dataset on growth and yield attributes of tomato (Solanum lycopersicum L.) · 2024
- negative
  Naphthalene acetic acid (NAA) gave tomato inferior crop health and production, lower than the control without PGRs
  compared with control (no PGRs)
cites 1 paper here
Substitution of Chemical Fertilization using PGRs Evident in Growth and Yield of Tomato · 2024
- negative
  NAA decreased tomato vegetative and reproductive traits including yield.

A paper is on the positive side when any of its claims here is positive. Claims are grouped by organism, treatment and what was measured or targeted. Claims that compare genotypes are left out; a claim about lacking a nutrient counts the other way round in that nutrient’s question. “Results differ” marks a question where two model reviewers, reading both claims, accepted at least one pair of papers whose results differ.

1-naphthaleneacetic acid · Yield · Solanum lycopersicum (tomato)

Papers whose results differ, checked claim by claim 1

How these papers cite each other

Papers reporting a positive result 21

Papers reporting a negative result or no effect 2

1-naphthaleneacetic acid on Solanum lycopersicum (tomato) against other targets

1-naphthaleneacetic acid · yield on other organisms