唐生菜好苦

收咗好多生菜，但煮完食發覺勁苦，有冇方法救救？

有d菜農話有兩個可能:
1.曾經制水
2.土壤太鹼性

缺肥水。。。

some explanation found in internet:
这个跟化肥没关系。。化肥躺着中枪。。。就是提供氮磷钾之类的，跟苦味没关系。
青菜萝卜芥菜西兰花白菜花生菜莴笋是种植季节温度高了容易发苦，黄瓜西葫芦冬瓜之类的是种的时候缺水，生病了容易发苦。
十字花科其实只有薄霜打了以后才有那个甜滋滋的味道。。。只是以前我们大多在早春和晚秋种这些菜，所以你觉得他们一定是甜滋滋的，现在流行一年四季只要能种的蔬菜都种，所以有些蔬菜在不是最好的季节也种了，然后他们就不高兴了，就产生次级代谢产物来苦你。。。

http://www.gardeningknowhow.com/ ... /bitter-lettuce.htm
Bitter Tasting Lettuce – Why Is My Lettuce Bitter?

Most gardeners will tell you that bitter lettuce is the result of summer heat. Lettuce is known as a cool season vegetable. When temperatures rise, the plant snaps into maturation mode and bolts, that is, sends out a stalk and flowers. It’s during this process that bitter lettuce is produced. This is a natural process that can’t be stopped, but it isn’t the only answer to what makes lettuce bitter.

Too little water can cause bitter lettuce. Those large flat leaves need a large amount of water to remain full and sweet. Brown leaf edges are a sure sign that you lettuce is thirsty either from lack of water or root damage from close cultivation. Water regularly and well. Don’t let the bed become bone dry.




Another answer to why does lettuce turn bitter is nutrition. Lettuce needs to grow fast. Without proper nutrients, growth becomes stunted and bitter tasting lettuce is the result. Fertilize regularly, but don’t get carried away. Some studies suggest that bitter lettuce can also be the result of too much nitrogen.

Lastly, aster yellows phytoplasma, commonly called aster yellows, is a disease that can cause bitter lettuce. With this infection, the interior leaves lose color and the outer leaves become stunted. The whole plant can become deformed.

Why is My Lettuce Bitter And What Can I Do About It

Most likely, your bitter lettuce is the result of the maturation process and there’s no way you can completely stop Mother Nature, but there are ways you can delay the result.

Mulch your lettuce to keep the roots cool and fool the plant into thinking its still spring. Interplant your lettuce with taller crops to provide shade as the weather warms. Succession planting will also help extend the season.

If you think nitrogen might be the cause of your bitter tasting lettuce, add a small amount of wood ash to your soil.

Finally, try refrigerating the bitter lettuce for 24-48 hours before serving

some more useful information:

http://tendingmygarden.com/lettu ... o-keeping-it-tasty/

多謝大家分享！
因为我知生菜要多水所以我成日淋。肥可能有关，我見佢地大得快所以少用肥。刚刚立刻用EM水補救！
泥係用新泥，相信pH唔关事吧。

生菜種的時間太長﹐長老了也會苦的﹐這是農友告訴我的

faylo 發表於 2013-3-14 21:44
some explanation found in internet:
这个跟化肥没关系。。化肥躺着中枪。。。就是提供氮磷钾之类的，跟 ...

同意....
我細個果陣家人以務農為生...
菜心..白菜...生菜..芥蘭等...都係天氣轉凍先種...
越凍尐菜就越甜...=)
最記得到農曆新年..又凍又濕O既天氣落田摘生菜嚟煮..
好味到不得了~~=)

昨天試食雪咗兩日又浸過的細棵生菜仍然係苦。
朋友説最近收D菜心也係苦。救命呀各位高人！