Organic nitrogen alone raised rice grain yield compared with no fertilizer.

nitrogen · yield · Oryza sativa (rice)Positive and negative results

1,802 papers in the same direction as this claim · 193 in the opposite direction · 49 reporting no difference from an alternative

1. negative
   Green manure and rice straw nitrogen, alone or in combination with inorganic N, gave lower grain yield, agronomic efficiency and apparent nitrogen uptake than a standard split application of prilled urea.

   Long-term Comparison of the Agronomic Efficiency and Residual Benefits of Organic and Inorganic Nitrogen Sources for Tropical Lowland Rice · 1996 · compared with a standard split application of prilled urea

   Opposite direction

2. negative
   Chaffy grain number and chaffy grain weight per 5 panicles increased significantly with enhancing nitrogen doses.

   Physiological response of rice (Oryza sativaL.) genotypes to elevated nitrogen applied under field conditions · 2014

   Opposite direction

3. negative
   Excessive nitrogen yielded 2.68–6.31% less than appropriate nitrogen application.

   Excessive Nitrogen Application Leads to Lower Rice Yield and Grain Quality by Inhibiting the Grain Filling of Inferior Grains · 2022 · compared with appropriate nitrogen application (270 kg N ha−1)

   Opposite direction

4. negative
   SCU reduced rice yield, though not significantly.

   Effects of different types of slow- and controlled-release fertilizers on rice yield · 2021

   Opposite direction

5. negative
   Preflood urea applied 14 days early yielded lowest grain yield of rice.

   Ammonia Volatilization and Nitrogen Uptake for Conventional and Conservation Tilled Dry‐Seeded, Delayed‐Flood Rice · 2007

   Opposite direction

6. no effect
   Applying 30 kg N ha−1 at each SPAD drop below 37.5 gave rice yields equivalent to 120 kg N ha−1 applied in three splits

   Chlorophyll Meter– and Leaf Color Chart–Based Nitrogen Management for Rice and Wheat in Northwestern India · 2002 · compared with 120 kg N ha−1 applied in three splits

   Opposite direction

7. no effect
   Ammonium sulphate nitrate gave growth, yield and grain nitrogen results statistically at par with Super Net.

   EFFECT OF NITROGEN FERTILIZERS ON GROWTH, YIELD AND QUALITY OF HYBRID RICE (ORYZA SATIVA) · 2005 · compared with sulphur-containing nitrogen fertilizer-Super Net

   Opposite direction

8. negative
   Rice straw plus urea mix-application (SU) gave lower rice plant growth, yield and nutrient accumulation.

   Application of different organic and mineral fertilizers on the growth, yield and nutrient accumulation of rice in a Japanese ordinary paddy field · 2010

   Opposite direction

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