The authors judged Zn plus B better for onion vegetative growth and yield.

zinc atom · yield · Allium cepa (onion)Results differ

32 papers in the same direction as this claim · 3 in the opposite direction

1. negative
   Repeated zinc applications depressed yield from the fifth through eleventh crops.

   Crop Responses to Some Micronutrients and Sodium on Sphagnum Peat Soil · 1964

   Opposite direction

2. negative
   FYM, NPK and sulfur, with or without boron and zinc, gave maximum bulb weight.

   Response of Onion to NPK, S and Micronutrients · 2020

   Opposite directionAbout lacking this nutrient, so it counts the other way round

3. no effect
   B, Cu and Zn application did not influence onion yield.

   Growth, nutrient accumulation and yield of onion as a function of micronutrient fertilization · 2022

   Opposite direction

4. positive
   The Zn and B combination was better for onion vegetative growth and yield.

   Effect of micronutrients on growth and yield of onion under calcareous soil environment · 2012

   Same direction

5. positive
   Zn at 50 mg/kg soil slightly increased onion yield, while higher levels reduced yield.

   Effect of Cd, Ni, Pb and Zn on growth and chemical composition of onion and fenugreek · 1990

   Same direction

6. positive
   Zn foliar application significantly increased onion yield relative to controls.

   Essential oil, growth and yield of onion (Allium cepa L.) in response to foliar application of some micronutrients. · 2009 · compared with control plants

   Same direction

7. positive
   Foliar Zn with 2,4-D increased onion bulb weight to 73.9 g.

   Effect Of Soil And Foliar Applications Of Zinc And Iron On The Yield And Quality Of Onion (Allium cepa L.) · 2013

   Same direction

8. positive
   Onion yield per hectare (379.6 q) was maximum in treatment T3 (Zn at 4 mg L-1) and also in T11.

   Response of micronutrients on qualitative and quantitative parameters of onion (Allium cepa L.) · 2012

   Same direction

27 papers more in this group