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同量~(32)P 用于不同处理的基肥中,即氮与标记放射性磷肥结合施用或磷肥单施,氮能促进春小麦对磷的吸收利用。试验表明,在 N_2~(32)P_1处理中,春小麦的植株、茎、叶、穗、根吸收示踪磷比~(32)P_1的处理多。在肥力低的土壤中,更加如此.春小麦在苗期生长缓慢,对放射性磷的吸收较少。从拔节到孕穗期吸收示踪磷迅速增加,孕穗期达高峰,开花到成熟期又逐渐下降。茎、叶中示踪磷含量开始较多,随着向穗中运转的增加而减少,穗中的示踪磷呈直线增加,与干物重的消长一致。氮磷结合使用,起到相互促进作用。N_2~(32)P_1处理,植株生长健壮,叶绿素含量增加,叶色浓绿,增加了光合面积,促进干物质的积累。氮能促进磷在叶片中的吸收与运转,N_2~(32)P_1的处理,叶内示踪磷比~(32)P_1的处理多,因而有利于穗分化,减少不孕小穗和退化小花,增加结实率和粒重,因此,N_2~(32)P_1比~(32)P_1处理的小穗,粒数和粒重增多。
The same amount of ~ (32) P for different treatment of the base fertilizer, nitrogen and labeled radioactive phosphate fertilizer or phosphate fertilizer alone, nitrogen can promote spring wheat phosphorus uptake and utilization. The results showed that in N_2 ~ (32) P_1 treatment, plantlets, stems, leaves, spikes and roots of spring wheat had more phosphorus than 32 P_1 treatments. This is even more so in low-fertility soils, where spring wheat grows slowly and absorbs less radioactive phosphorus. From the jointing to the booting stage, the tracer P rapidly increased, the peak reached the booting stage, and gradually decreased from flowering to maturity. The content of phosphorus in stems and leaves began to be more, and decreased with the increase of operation to ear. The tracer phosphorus in ear increased linearly with the increase and decrease of dry matter weight. Nitrogen and phosphorus combined use, play a role in promoting each other. N_2 ~ (32) P_1, the plants grew robustly, the content of chlorophyll increased, the leaf color became dark green, which increased the photosynthetic area and promoted the accumulation of dry matter. Nitrogen can promote the uptake and operation of phosphorus in leaves. N 2 ~ (32) P 1 treatment and leaf tracing of phosphorus were more than that of ~ (32) P 1 treatment, which was good for spike differentiation and the reduction of spikelets and degeneration, Increased the seed setting rate and grain weight. Therefore, the number of spikelets, grain number and grain weight of N_2 ~ (32) P_1 ~ (32) P_1 treatment increased.