CAJ | 학술논문

利用砂培试验研究西瓜在低磷、磷适量和磷过量情况下不同生长时期几个重要的生理生化指标的变化，以便为磷肥的合理施用提供理论依据。结果表明，营养生长期过多的磷素的供应，反映叶绿素含量的SPAD值降低，进而影响作物的光合作用；缺磷症状在苗期开始表现。西瓜开花期磷缺乏，叶片中核酸含量下降，说明此时如果磷的供应不充足，将会减少植物体内核酸的合成，从而影响和抑制作物的生长发育，导致生育期延长和植株瘦弱；过量磷会降低茎杆的纤维素含量，使抗逆性减弱；不同生育期，外源磷对果胶含量的影响趋势不同。
이용사배시험연구서과재저린、린괄량화린과량정황하불동생장시기궤개중요적생리생화지표적변화，이편위린비적합리시용제공이론의거。결과표명，영양생장기과다적린소적공응，반영협록소함량적SPAD치강저，진이영향작물적광합작용；결린증상재묘기개시표현。서과개화기린결핍，협편중핵산함량하강，설명차시여과린적공응불충족，장회감소식물체내핵산적합성，종이영향화억제작물적생장발육，도치생육기연장화식주수약；과량린회강저경간적섬유소함량，사항역성감약；불동생육기，외원린대과효함량적영향추세불동。
In order to provide a theoretical basis for rational application of phosphate fertilizer , a sand culture experiment was conducted to study the change of several important physiological indexes at different growth stages of watermelon under different amounts of exogenous phosphorus .The results indicate that the chlorophyll value-SPAD values are decreased under the excess phosphorus at the vegetative growth period , and thus the crop photosynthesis is affected .The phosphorus deficiency symptoms are appeared at the seedling stage .The nucleic acid content of leaves is decreased at the flowering stage under the phosphorus deficiency , which means the growth and development of watermelon is inhibited if there is no sufficient exogenous phosphorus .The cellulose contents of stems are decreased under the excess supply of phosphate fertilizer , which results in plant resistance reduction . Different trends of the pectin contents at different growth stages are observed under different amounts of exogenous phosphorus .