Sheep manure plus Agro Sol Tonic at second irrigation produced the highest trait means.

irrigation · quality: protein · Hordeum vulgare (barley)Positive and negative results

3 papers in the same direction as this claim · 2 in the opposite direction

1. no effect
   Dough-stage irrigation cutoff did not significantly change grain protein content.

   Reducing nitrogen and deficit irrigation is a practical solution for optimal forage barley production in semi-arid cropping systems · 2024

   Opposite direction

2. negative
   Irrigation markedly reduced crude protein content of wheat, barley and oats regardless of timing.

   Sprinkler irrigation on clay soils in southern Finland III. Effect on the quality of grain yield · 1967

   Opposite direction

3. positive
   Two irrigations with 90 kg nitrogen per hectare gave the highest protein content compared with the other irrigation and nitrogen treatments.

   Effect of levels of irrigation and nitrogen on growth, yield and nitrogen uptake in barley · 2019 · compared with other irrigations (no irrigation, one irrigation at tillering stage, one irrigation at flag leaf stage) and nitrogen treatments (0, 30 and 60 kg ha-1)

   Same direction

4. positive
   Dry irrigation increased grain protein content.

   EFFECT OF IRRIGATION SCHEDULING AND NITROGEN FERTILIZATION ON BARLEY YIELD AND WATER USE EFFICIENCY · 2012

   Same direction

5. positive
   Stopping irrigation at flowering increased grain protein by 38% relative to normal irrigation.

   Can Foliar Molybdenum Compensate for Damage to Barley Because of Draught Stress? · 2014 · compared with normal irrigation

   Same direction

fertilization · quality: protein · Hordeum vulgare (barley)Positive and negative results

63 papers in the same direction as this claim · 14 in the opposite direction · 1 reporting no difference from an alternative

1. no effect
   K fertilizer generally did not affect barley grain protein content or hectolitre weight.

   Increasing applications of potassium fertiliser to barley crops grown on deficient sandy soils increased grain yields while decreasing some foliar diseases · 2007

   Opposite direction

2. negative
   Reduced nitrogen lowered barley protein concentration.

   The effect of free air carbon dioxide enrichment and nitrogen fertilisation on the chemical composition and nutritional value of wheat and barley grain · 2013

   Opposite direction

3. negative
   More nitrogen fertilizer decreased lysine in protein from 31 to 29 g/160g N.

   Effects of variety, soil type and nitrogen fertilizer supply on the nutritive value of barley for growing pigs · 1997

   Opposite direction

4. no effect
   Grain protein concentration of all barley cultivars was unaffected by slurry except at the highest application rate.

   Agronomic performance of barley cultivars in response to varying rates of swine slurry · 2011

   Opposite direction

5. negative
   Reduced fertilization decreased barley protein concentration.

   Effects of different nitrogen fertilization systems on crop yield and nitrogen use efficiency – Results of a field experiment in southern Germany · 2024 · compared with GFO

   Opposite direction

6. no effect
   Micronutrient fertilization (Fe, Zn, Mn, Cu) had no significant effect on grain protein percentage or tiller number in barley.

   The Effect of Dose and Different Methods of Iron, Zinc, Manganese and Copper Application on Yield Components, Morphological Traits and Grain Protein Percentage of Barley Plant (Hordeum vulgare L.) in Greenhouse Conditions · 2012

   Opposite direction

7. no effect
   After 10 years, P and K in shoots, grain yield and protein in grain did not differ among P and/or K fertilization treatments.

   The Association of Barley with AM Fungi Can Result in Similar Yield and Grain Quality as a Long Term Application of P or P-K Fertilizers by Enhancing Root Phosphatase Activity and Sugars in Leaves at Tillering · 2004 · compared with treatments

   Opposite direction

8. no effect
   Adjusting supplementary nitrogen fertilisation had no significant effect on grain starch and crude protein content.

   Spring barley as affected by nitrogen and sulphur fertiliser rates calculated using different diagnostic methods · 2014

   Opposite direction

70 papers more in this group