论文部分内容阅读
将番木瓜品种“蜜露”(Honeydew)种植于纯沙中,提供完全营养,但缺少铁、锌或硼。缺素水平为:铁0.014或0.056mg/l,锌0.0065或0.013mg/l,硼0.0033或0.033mg/l。缺铁和缺硼症状出现在幼叶上,缺锌症状出现在中龄叶上。缺铁对生长抑制最大,缺锌对生长抑制最小。严重缺铁、缺锌或缺硼植株的受害叶叶每克干物质中分别仅含铁85μg,锌13 μg, 硼6.7 μg;而正常植株对照叶片每克干物质分别含铁140 μg,锌22.4 μg,硼17.3 μg。
Honeydew, a papaya variety, is planted in pure sand to provide complete nutrition but lack iron, zinc or boron. Iron deficiency levels were 0.014 or 0.056 mg / l for iron, 0.0065 or 0.013 mg / l for zinc, 0.0033 or 0.033 mg / l for boron. Iron deficiency and boron deficiency appear in young leaves, zinc deficiency symptoms appear in the middle-aged leaves. Iron deficiency had the strongest growth inhibition and zinc deficiency had the least growth inhibition. The iron deficiency, zinc deficient or boron-deficient plants contained only 85 μg of iron, 13 μg of zinc and 6.7 μg of boron, respectively, per gram of dry matter, whereas those of normal plants were 140 μg / μg, boron 17.3 μg.