Canopy temperature difference and the related characteristics at heading stage in rice | 姘寸榻绌灞娓╁害寮剁稿崇规х绌

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anglais. The canopy temperature difference and related characteristics were studied through observing surface temperature of stalk and leaf, stomata and yield characters of different rice varieties (lines) under three conditions: sunny day with water, sunny day without water and at night with water. The results showed that there was obvious temperature difference among different genotypes. Rice canopy temperature had significant difference: warm-temperate, cold-temperate and mid-temperate types under different weather and soil moisture; Canopy temperature with water in field was in generally lower than that without water, and it was lower at night than in daytime. The canopy temperature of two types discrepancy was 0.1-2.3 on average in the situation of having water in sunny day. while without water the discrepancy was 0-6.7 on average, and it differ 0-1.4 when having water at night. Compared with cold-temperate type rice. stomatal length and width of warm-temperate type larger, while stomatal density and transpiration rate were lower. Generally speaking, the yield of warm-temperate step was higher than that of that of cold-temperate type varieties, but not significant, and the diversity among yield components were not obvious. The brown rice rate, milled rice rates and amylose content of cold-temperate type rice were higher, chalky grain rate and chalkiness were lower, milling and grain appearance qualities were above normal, there was no inconspicuous regularity among other rice guality characteristics.