论文部分内容阅读
1.番茄 株形是长方形,节间正常,胚轴长度在2厘米左右,直到第5节节间长度慢慢增加,第5节之后节间近乎等长.茎杆粗细匀称,说明发育正常.这样的苗,叶片为手掌形,叶片厚,叶脉粗壮隆起,叶端尖,具有光泽.小叶片大,叶柄短粗者为好.反之叶柄又长又粗,小叶片小,表示有徒长的趋势.这样的苗株形呈倒三角形,上大下小.茎越往上变粗越明显.节间也渐长.徒长的原因是氮肥过多,灌水过多,夜间温度过高,日照不足.如果叶色浓
1. Tomato plant shape is rectangular, internode normal, hypocotyl length of about 2 cm, until the 5th internode length slowly increased after the fifth internodes almost equal length of stem thickness symmetry, indicating normal development. Such seedlings, leaves for the palm-shaped, thick leaves, veins thick bulge, the tip of the leaves, with a gloss. Small leaf blade, petiole stubby as well. On the contrary petiole long and thick, small leaflets, said the growth of leggy The shape of this seedlings was inverted triangle, the upper and lower small stem more upwards become more obvious. Interna also grow. The reason is leggy too much nitrogen, excessive irrigation, the night temperature is too high, lack of sunshine. If the leaves thick color