N、P肥对裸燕麦生产性能的影响

研究了N、P用量及其配比对裸燕麦(4600)秸秆株高、秸秆产量和种子产量,以及小穗数、单株粒重、每穗粒数和千粒重的影响.结果表明,除株高外,施肥处理对裸燕麦各生产性能指标均有显著影响(P＜0.05),在施N量0～135 kg/hm2或施P量0～90 kg/hm2下,随施肥量增加,种子产量和秸秆产量均明显提高.在N90P90和N135P90时,裸燕麦种子和秸草产量最高,分别为3 400 kg/hm2和20 700 kg/hm2.种子产量与穗数、千粒重、单株粒重和穗粒数间均呈极显著或显著正相关关系(P＜0.01或P＜0.05).裸燕麦秸秆产量yg或种子产量ys(kg/hm2)可用其与N (kg/hm2)和P (P2O5,kg/hm2)肥间的二元二次回归方程yg=16 380.76 14.811xN 32.272xP-0.015xN2-0.114xP2 0.026xNxP(R2=0.886***)和ys=2 597.605 12.369xN 4.277xP-0.067xN2-0.006xP2-0.020xNxP(R2=0.959***)很好的估测.

Effect of nitrogen and phosphorus fertilization on the naked oat production performance

The effect of different nitrogen and phosphorus 1evels on the plant height,stalk yield,seed yield,spikes,seed weight per plant,seeds of each spike and weight per 1 000 seeds of naked oat(Avena sativa var.4600) were researched in this study.The results showed that,excluding its plant height,the nitrogen and phosphorus fertilization had a significant effect on each index of naked oat(P<0.05),seed yield and stalk yield increased with the fertilizer levels increasing from 0 to 135 kg/hm2 N or from 0 to 90 kg/hm2 P.Seed yield and grass yield were 3 400 kg/hm2 and 20 700 kg/hm2 for N90P90 and N135P90 plots,respectively.A positive correlation exhibited between seed yield and spikes or seed weight per plant or seeds of each spike or weight per 1000 seeds spikes(P<0.01 or P<0.05).Stalk yield or seed yield could be estimated by the following models,yg=16 380.76 14.811xN 32.272xP-0.015xN2-0.114xP2 0.026xNxP(R2=0.886***)or ys=2 597.605 12.369xN 4.277xP-0.067xN2-0.006xP2-0.020xNxP(R2=0.959***);where yg(kg/hm2) and ys(kg/hm2) are stalk yield and seed yield,respectively,and P(P2O5,kg/hm2) and N(kg/hm2) and P(P2O5,kg/hm2) are their fertilizer levels.