Abstract
Abstract There is usually a positive yield response when sulfur (S) is applied to rapeseed (Brassica rapa L.) plants grown on S-deficient soils. Recommendations include application of some of or the entire amount of S at planting, but the plant requirement as well as availability of S to rapeseed during its various phenological stages is not well documented. In a field trial, 40 kg S ha−1 was applied as gypsum (CaSO4·2H2O) at planting (T1), during vegetative (T2, 30 days after sowing), flowering (T3, 50 days after sowing), and pod-filling (T4, 65 days after sowing) stages, and in split doses (T5). Biomass accumulation, leaf-area index, and leaf photosynthetic rate were studied at various growth stages. Seed S (sulfate and organic S) and yield parameters were studied at harvest. Sulfur (40 kg S ha− 1) applied in three split doses during different growth stages caused maximum increase in these parameters, followed by T2 and T1. However, no significant discernable difference was observed for the application at planting (T1) and during vegetative stage (T2). No significant response was seen following the application of T3 and T4 when compared with the control (T0). On the basis of these results, we concluded that application of S fertilizer in split doses during growth stages is better than application of the entire amount of S at any stage for obtaining optimum yield of rapeseed.
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Claims 4
Claim · model-written summary
Sulfur applied in three split doses during growth stages caused the maximum increase in biomass accumulation, leaf-area index and leaf photosynthetic rate, followed by T2 and T1.
Verbatim
e1“Biomass accumulation, leaf-area index, and leaf photosynthetic rate were studied at various growth stages”
e2“Sulfur (40 kg S ha− 1) applied in three split doses during different growth stages caused maximum increase in these parameters, followed by T2 and T1”
t0“Rapeseed”
Claim · model-written summary
Sulfur applied at planting (T1) and during the vegetative stage (T2) showed no significant difference.
Verbatim
e3“However, no significant discernable difference was observed for the application at planting (T1) and during vegetative stage (T2)”
t0“Rapeseed”
Claim · model-written summary
Sulfur applied at flowering (T3) and pod filling (T4) gave no significant response compared with the control (T0).
Verbatim
e4“No significant response was seen following the application of T3 and T4 when compared with the control (T0)”
t0“Rapeseed”
Claim · model-written summary
Applying S fertilizer in split doses during growth stages is better for optimum rapeseed yield than applying the entire S amount at any single stage.
Verbatim
e5“application of S fertilizer in split doses during growth stages is better than application of the entire amount of S at any stage for obtaining optimum yield of rapeseed”
t0“Rapeseed”
The same questions in other papers
stage · physiology: photosynthesis · Brassica napus (oilseed rape)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- negative
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Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.