Urea 0 kg/ha and KCl 150 kg/ha gave the best tuber number.

potassium chloride · yield · Allium cepa (onion)Results agree

8 papers in the same direction as this claim

1. positive
   NPK Phonska 300 kg/ha with KCl 100 kg/ha gave the best tiller number, 11.56 per cluster.

   Applications of NPK Phonska and KCl Fertilizer for the Growth and Yield of Shallots (Allium Ascalonicum) in Serang, Banten · 2014

   Same direction

2. positive
   Biourine with the stated NPK regimen gave the highest bulb yield, 1,932.2 kg m -2.

   APPLICATION OF BIOURINE ON GROWTH AND YIELD OF SHALLOT FERTILIZED WITH INORGANIC AND ORGANIC FERTILIZER IN BATU, EAST JAVA · 2015 · compared with 5 t ha -1 organic fertilizer without Biourine

   Same direction

3. positive
   The K1P1 fertilizer combination gave the highest shallot production.

   Pengaruh Pemberian Pupuk Kandang Kerbau dan Dosis Pupuk Anorganik Terhadap Hara N, P, K Tanah, Pertumbuhan dan Produksi Bawang Merah (Allium ascalonicum L.): The Effect of Buffalo Manure and Doses of Inorganic Fertilizer on The Soil Nutrient of Nitrogen, Phosphate, Potassium, Growth and Production of Shallot (Allium ascalonicum L.) · 2017

   Same direction

4. positive
   KCl at 150 kg/ha gave higher shallot yield than other KCl doses, with a significant difference.

   Growth and yield of shallot using KCl fertilizer at peatlands in Central Kalimantan, Indonesia · 2021 · compared with other KCl dosage treatments

   Same direction

5. positive
   The combined fertilizer treatment gave the highest yield.

   Response of Growth and Yield of Shallots to Various Types of Fertilizer in North Minahasa regency · 2022 · compared with 4 fertilization treatment

   Same direction

6. positive
   Direct sowing with 75% K2SO4 and 25% KCl gave the highest dry bulb yield.

   Onion Bulb Yield and Quality as Influenced by Seed or Seedling Planting Methods As well as Potassium Fertilizer Forms, K2SO4 and KCl, and Their Combination · 2023

   Same direction

7. positive
   200 kg ha−1 KCl gave fresh tuber weight of 12.35 tons ha−1, higher than lower rates.

   Tropic soil properties and productivity of Shallot Lembah Palu variety · 2023 · compared with 100 kg KCl ha −1

   Same direction

8. positive
   KCl fertilizer at 1.2 g/plant with 0 g/plant humic acid gives good growth and yield of spring onion

   Effect of KCl Fertilizer and Humic Acid to The Growth and Yields Of Spring Onion (Allium fistulosum L.) · 2024

   Same direction

nitrogen · yield · Allium cepa (onion)Positive and negative results

156 papers in the same direction as this claim · 23 in the opposite direction · 4 reporting no difference from an alternative

1. negative
   High combined nitrogen and sulphur rates had an antagonistic effect on bulb nutrient uptake, yield components and yield.

   Nutrient uptake and yield of onion as influenced by nitrogen and sulphur fertilization · 2008

   Opposite direction

2. negative
   Total yield at the lowest nitrogen rate was lower than at higher rates.

   Bolting, Yield, and Bulb Decay of Sweet Onion as Affected by Nitrogen Fertilization · 2003 · compared with higher N rates

   Opposite direction

3. negative
   Onion yield decreased by 95 Mg·ha -1 for each 25% increase in the proportion of urea in fertilizer blends.

   Nitrogen Use Efficiency and Onion Yield Increased with a Polymer-coated Nitrogen Source · 2002

   Opposite direction

4. no effect
   Yields of cabbage, carrots and onions were generally unaffected by N rate, except in cabbage in 2000.

   Assessment of Chlorophyll and Nitrate Meters as Field Tissue Nitrogen Tests for Cabbage, Onions, and Carrots · 2004

   Opposite direction

5. negative
   N, P and K addition depressed onion yield in the first year.

   N–P–K FERTILIZER EFFECTS ON YIELD, COMPOSITION AND RESIDUES OF LETTUCE, CELERY, CARROT AND ONION GROWN ON AN ORGANIC SOIL IN QUEBEC · 1975

   Opposite direction

6. negative
   An N rate of 120 kg ha−1 led to a yield drop in onion.

   Onion (Allium cepa L.) Yield and Growth Dynamics Response to In-Season Patterns of Nitrogen and Sulfur Uptake · 2020

   Opposite direction

7. no effect
   Higher fertilization did not increase onion yield beyond stated N, P and K levels.

   OPTIMAL SOIL pH AND SUFFICIENCY CONCENTRATIONS OF N, P AND K FOR MAXIMUM ALFALFA AND ONION YIELDS ON ACID ORGANIC SOILS · 1980

   Opposite direction

8. no effect
   Nitrogen manuring had practically no effect on yield.

   STUDIES IN THE PHYSIOLOGY OF THE ONION PLANT · 1947

   Opposite direction

175 papers more in this group