Lettuce Plant Temperature Tolerance

Cold-adapted varieties survive much lower temperatures. Cold hardy plants can easily handle light to moderate frosts without being harmed.

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Of 2 ºC was thus likely sufficient to influence plant development.

Lettuce plant temperature tolerance. Artificial lighting is discouraged because its monetary and energy expenditure surpass the marginal value attained from increased growth rate. The upper temperature limit to grow heading lettuces is 28C83F Unfortunately the CosRomaine types my favourite are also very heat susceptible. 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 requires ample and carefully proscribed nutrition. Lettuce can tolerate a few days of temperatures from 80 to 85F provided that nights are cool. Thylakoid mem-brane and the plasma membrane than the mitochondria were more susceptible to heat damage8.

A freeze or frost is when the nighttime temperature is between 28-32 degrees F. Overheating of the lettuce will cause flowering or bolting which will result in a bitter taste. It is best to.

Many studies showed that the cell membrane more sensitive to high temperature was the core issues of heat damage and heat resistance of plant. Thats when the temperature at night drops below 28 degrees F. Summer lettuce crops can be problematic if you live in a hot or very warm summer region.

Seed germinates best at about 75 degrees F. Temperature ranges of 60 to 65F in the day and 50 to 55F should be maintained since higher temperatures will stunt development. 4 rows Lettuce grows best at temperatures of 55 to 65 degrees Fahrenheit.

When To Plant Cold Hardy Vegetables. You can use misters that will adapt to your drip irrigation. The ideal soil temperature for germination though is 70 to 75 F.

The ideal temperature range for lettuce plant growth is 155 to. 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. 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.

Set the misters at about 5-foot intervals and run them for an hour or two on days when the. Another way of saying this is these plants can tolerate a hard frost. To grow lettuce in the summer select heat-tolerant or slow-to-bolt varieties and used a midday misting to keep the crop cool.

Keeping the plants pH level in check is very important for its nutrient intake. According to Brunini et al. 1976 when lettuce plants are exposed to temperatures higher than 22 C their rate of development decreases.

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. Lettuce seed will germinate at a temperature as low as 40 degrees F. It is best to maintain the temperature at around 55 F at night and at around 75 F at daytime.

Plants cells are filled with water so as the temperature hovers around freezing the water turns to ice and bursts the cell walls. At 70 to 80F the plants flower and produce seed. Depending on its variety lettuce seed can germinate when the soil temperature is 35 to 80 degrees Fahrenheit.

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. Lettuce seed will germinate at 35F but optimum germination is 70 to 75F. Cool summer lettuce with a spray of water.

I do grow those but they are the first to bolt to seed at the first sign of hot weather. 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. Theres also whats known as a hard or killing frost which is more severe.

A mature cold hardy plant can withstand actual freezing temperatures 32F0C for a period of time and even temperatures below freezing. Lettuce is adapted to cool growing conditions with the optimum temperatures for growth of 60 to 65F. Suitable air temperatures range from 12 21C with 18C the optimum.

The most heat tolerant kinds of lettuce are the open leafed varieties. Effects of heat stress on the content of soluble sugar in leaf lettuce seedlings. Colder temperatures 26-31 degrees F may burn foliage but will not kill broccoli cabbage cauliflower chard lettuce mustard onion radish and turnip.

Temperatures over 70. An average decrease in photosynthetic pigments of 25 was observed during heat stress and afterwards which may be a sign of stress.

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