Lettuce Plant Temperature Tolerance

Thylakoid mem-brane and the plasma membrane than the mitochondria were more susceptible to heat damage8. Thats when the temperature at night drops below 28 degrees F.

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Temperature ranges of 60 to 65F in the day and 50 to 55F should be maintained since higher temperatures will stunt development.

Lettuce plant temperature tolerance. When To Plant Cold Hardy Vegetables. Another way of saying this is these plants can tolerate a hard frost. These experiments demonstrate that heat stress due to an air temperature of 44 С held for 4 h did not result in any considerable disturbance of the photosynthetic apparatus of wheat and lettuce plants.

Lettuce seed will germinate at 35F but optimum germination is 70 to 75F. To grow lettuce in the summer select heat-tolerant or slow-to-bolt varieties and used a midday misting to keep the crop cool. Lettuce seed will germinate at a temperature as low as 40 degrees F.

Summer lettuce crops can be problematic if you live in a hot or very warm summer region. Of 2 ºC was thus likely sufficient to influence plant development. Plants cells are filled with water so as the temperature hovers around freezing the water turns to ice and bursts the cell walls.

Keeping the plants pH level in check is very important for its nutrient intake. Cold hardy plants can easily handle light to moderate frosts without being harmed. Lettuce can tolerate a few days of temperatures from 80 to 85F provided that nights are cool.

This plant is particularly sensitive to dissolved minerals and requires water with a salt content of 25 ppt or less and an absence of lime. Effects of heat stress on the content of soluble sugar in leaf lettuce seedlings. I do grow those but they are the first to bolt to seed at the first sign of hot weather.

Cool summer lettuce with a spray of water. It is best to. Overheating of the lettuce will cause flowering or bolting which will result in a bitter taste.

It requires growth temperatures of at least 15 o C 59 o F and grows best around 22 to 30 o C 72-86 o F. Depending on its variety lettuce seed can germinate when the soil temperature is 35 to 80 degrees Fahrenheit. A mature cold hardy plant can withstand actual freezing temperatures 32F0C for a period of time and even temperatures below freezing.

A freeze or frost is when the nighttime temperature is between 28-32 degrees F. It is best to maintain the temperature at around 55 F at night and at around 75 F at daytime. According to Brunini et al.

In general a frost 31-33 degrees F will kill beans cantaloupe corn cucumbers eggplant okra peas pepper potatoes sweet potatoes squash tomatoes and watermelon. The ideal temperature range for lettuce plant growth is 155 to. Cold-adapted varieties survive much lower temperatures.

Colder temperatures 26-31 degrees F may burn foliage but will not kill broccoli cabbage cauliflower chard lettuce mustard onion radish and turnip. Suitable air temperatures range from 12 21C with 18C the optimum. The upper temperature limit to grow heading lettuces is 28C83F Unfortunately the CosRomaine types my favourite are also very heat susceptible.

Lettuce is adapted to cool growing conditions with the optimum temperatures for growth of 60 to 65F. An average decrease in photosynthetic pigments of 25 was observed during heat stress and afterwards which may be a sign of stress. Set the misters at about 5-foot intervals and run them for an hour or two on days when the.

Lettuce requires ample and carefully proscribed nutrition. The apical meristem of young lettuce plants is near the soil surface so plant growth is often more closely matched to soil temperature than air temperature. Theres also whats known as a hard or killing frost which is more severe.

You can use misters that will adapt to your drip irrigation. Artificial lighting is discouraged because its monetary and energy expenditure surpass the marginal value attained from increased growth rate. The ideal soil temperature for germination though is 70 to 75 F.

Many studies showed that the cell membrane more sensitive to high temperature was the core issues of heat damage and heat resistance of plant. At 70 to 80F the plants flower and produce seed. Lettuce is a cool-weather crop that thrives in the temperature range 60-65 degrees F and if thoroughly hardened most varieties survive temperatures as low as 20 degrees F.

Temperatures over 70. 4 rows Lettuce grows best at temperatures of 55 to 65 degrees Fahrenheit. Seed germinates best at about 75 degrees F.

1976 when lettuce plants are exposed to temperatures higher than 22 C their rate of development decreases. The most heat tolerant kinds of lettuce are the open leafed varieties.

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