Abstract
The potential yield of wheat is mainly determined by temperature, solar radiation and the photothermal quotient. The objective of this study was to determine the temporal and spatial variability of the photothermal quotient and the frost risk to identify suitable sowing dates for wheat in Parana State, Brazil. The results showed that the photothermal quotient has greater spatial variability than temporal variability. The sowing date affects crop conditions that can in turn affect yield. However, the photothermal quotient and frost risk fluctuate differently in different Value for Cultivation and Use (VCU) regions. The regions VCU 1 and VCU 2 showed greater temporal variability of the photothermal quotient. The photothermal quotient ranged from 1.5 to 2.0 MJ m -2 day oC in VCU 1, from 1.1 to 1.5 MJ m -2 day oC in VCU 2 and from 1.0 to 1.2 MJ m -2 day oC in VCU 3. Sowing performed in June provided the greatest photothermal quotient in all VCU regions. However, June sowing increased the frost risk in VCU 1. Thus, the sowing date can be used as a management tool for the attainment of higher yield in wheat.
Highlights
ObjectivesThe objective of this study was to determine the temporal and spatial variability of the photothermal quotient and the frost risk to identify suitable sowing dates for wheat in Parana State, Brazil
Wheat is one of the world’s most important crops for human nutrition and animal feed
The results showed that more than 60% of the cycle of the cultivar BRS Guamirim was included in the period terminal spikelet (TS)-physiological maturity (PM), indicating the importance of the duration of this period in determining the yield potential of the crop
Summary
The objective of this study was to determine the temporal and spatial variability of the photothermal quotient and the frost risk to identify suitable sowing dates for wheat in Parana State, Brazil. The objective of this study was to characterize the temporal and spatial variability of the photothermal quotient (PQ) and the frost risk in Parana State, Brazil to identify sowing dates for wheat that optimize yield potential
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