Seed yield of castor improved by 44% with RDF + 20 kg ZnSO4/ha plus foliar 2% WSCF at 40 DAS over soil application of RDF and 125% RDF.

zinc sulfate · yield · Ricinus communis (castor bean)Results agree

4 papers in the same direction as this claim

1. positive
   Twice-applied foliar ZnSO4 gave higher seed yield than other treatments.

   Response of Rainfed Castor to Soil and Foliar Application of Zinc and Iron Micronutrients · 2021 · compared with rest of the treatments

   Same directionCited by this paper

2. positive
   Application of 75% RDF NPK plus ZnSO4 maximized primary spike length, spike number and capsules per spike compared with other inorganic nutrients.

   Influence of Integrated Nutrient Management Practices on Yield Attributes, Seed Yield, Oil Yield and Nutrient Uptake of Castor under Irrigated Conditions · 2009 · compared with other inorganic nutrients

   Same direction

3. positive
   The soil nutrient treatment followed by 2% foliar fertilizer at 40 days gave castor seed yield of 1,604 kg/ha, 11.38% above 125% RDF.

   Balanced crop nutrition with mid-season foliar fertilization enhances productivity, profitability and partial factor productivity in rainfed castor (Ricinus communis) · 2023 · compared with 125% recommended dose of fertilizer (RDF)

   Same direction

4. positive
   Soil zinc followed by foliar iron gave significantly higher castor seed yield than RDF or soil iron.

   Efficacy of zinc and iron nutrition on growth, yield, quality and economics of castor (Ricinus communis L.) under semi-arid environment · 2025 · compared with RDF and RDF + 25 kg/ha Ferrous Sulphate as soil application at the time of sowing

   Same direction

application · yield · Ricinus communis (castor bean)Positive and negative results

15 papers in the same direction as this claim · 1 in the opposite direction

1. positive
   Twice-applied foliar ZnSO4 gave higher seed yield than other treatments.

   Response of Rainfed Castor to Soil and Foliar Application of Zinc and Iron Micronutrients · 2021 · compared with rest of the treatments

   Same directionCited by this paper

2. negative
   The 1.0% KI spray caused 16% seed yield reduction in primary order spikes.

   Standardization of procedure for assessing terminal drought stress tolerance induced by foliar spraying of potassium iodide and identification of promising castor germplasm using the developed procedure · 2019

   Opposite direction

3. positive
   The foliar Trichoderma applications enhanced castor yield compared with untreated control.

   Liquid Formulation of Trichoderma Species for Management of Gray Mold in Castor (Ricinus communis L.) and Alternaria Leaf Blight in Sunflower (Helianthus annuus L.) · 2015 · compared with untreated control

   Same direction

4. positive
   MC at 100 to 200 g a.i. ha −1 increased filled fruits per raceme by 24.0–38.8%.

   Mepiquat Chloride Effects on Castor Growth and Yield: Spraying Time, Rate, and Management · 2018

   Same direction

5. positive
   The highest yield components of castor bean were achieved with foliar application of humic acid (recommended rate) and Zn-nano fertilizer under normal irrigation in the second year.

   Castor bean (Ricinus communis L.) responses to drought stress and foliar application of Zn-nano fertilizer and humic acid: grain yield, oil content, antioxidant activity, and photosynthetic pigments · 2021

   Same direction

6. positive
   Application of 75% RDF NPK plus ZnSO4 maximized primary spike length, spike number and capsules per spike compared with other inorganic nutrients.

   Influence of Integrated Nutrient Management Practices on Yield Attributes, Seed Yield, Oil Yield and Nutrient Uptake of Castor under Irrigated Conditions · 2009 · compared with other inorganic nutrients

   Same direction

7. positive
   Foliar application of zinc nano-chelate increased grain number of castor by 14.4%.

   Responses of Castor (Ricinus communis l.) to Foliar Application of Zinc Nano-Chelate and Humic Acid under Limited Irrigation · 2019

   Same direction

8. positive
   Graded phosphorus, sulphur and boron significantly enhanced castor seed yield.

   Yield of Castor by Fertilizing with Phosphorus, Sulphur and Boron · 1993

   Same direction

8 papers more in this group

fertilization · yield · Ricinus communis (castor bean)Positive and negative results

39 papers in the same direction as this claim · 2 in the opposite direction · 1 reporting no difference from an alternative

1. positive
   Castor sole cropping and castor intercropping fertilized with 80 kg N/ha gave higher return.

   Effect of planting pattern and fertilizer management on castor (Ricinus communis) based intercropping system · 2001

   Same directionCited by this paper

2. positive
   Recommended fertilizer raised castor yield by about 22.13% versus 75% RRF.

   Impact of mineral nutrition and biopriming on crop performance, energetics, and the carbon footprint in rainfed castor bean (Ricinus communis L.) · 2025 · compared with 75 %

   Same directionCites this paper

3. no effect
   Fertilization type did not affect nectar production.

   Interaction Effect Between Herbivory and Plant Fertilization on Extrafloral Nectar Production and on Seed Traits: An Experimental Study WithRicinus communis(Euphorbiaceae) · 2016

   Opposite direction

4. no effect
   Aruna yield was at par between fertilizer conditions.

   Performance of castor (Ricinus communis) cultivars and their response to fertilizer and plant protection · 1995 · compared with unfertilized

   Opposite direction

5. no effect
   Grain production did not differ among the three fertilization levels.

   Evaluation of fertilization of hydroponically cultivated castor bean (Ricinus communis L.) · 2025 · compared with among them

   No difference from an alternative

6. positive
   Integrated fertilizer and manure use produced castor seed yield of 827.

   LONG‐TERM MANURING AND FERTILIZER EFFECTS ON DEPLETION OF SOIL ORGANIC CARBON STOCKS UNDER PEARL MILLET‐CLUSTER BEAN‐CASTOR ROTATION IN WESTERN INDIA · 2011

   Same direction

7. positive
   Isolate MAJ PIA03 applied with 50 % of the recommended inorganic fertilizer enhanced number of leaves per plant, leaf biomass and root length in castor.

   Impact of Pseudomonas aeruginosa MAJ PIA03 affecting the growth and phytonutrient production of castor, a primary host-plant of Samia ricini · 2017 · compared with recommended dose of inorganic fertilizers

   Same direction

8. positive
   Recommended fertilizer to base crop raised succeeding castor yield.

   Sustainability of sunflower-based crop sequences in rainfed alfisols · 2003

   Same direction

34 papers more in this group