农用稀土对作物吸收养分的效应研究

本文通过田间试验与盆栽试验研究了农用稀土对水稻、小麦、玉米三种作物吸收养分的效应。在喷施0.03%和0.06%浓度的稀土液后,测其体内氮、磷、钾及微量元素含量,结果表明:①施用稀土后,可促进作物根系的生长,使根数增加3.20%,根长增加7.95—11.47%,根体积增加14.10—18.41%,扩大了养分吸收面积,吸显地促进了作物对氮、磷的吸收;②对氮的吸收效果最显著,并表现出0.03%较0.06%浓度的稀土液效果更佳的趋势;③对钾的吸收效果小,氮、磷表现出低浓度(0.03%RE)的促进,高浓度(0.06%RE)的抑制效应;④稀土对小麦吸收锰、钢、锌、钼等微量元素有良好的影响,水稻对钼、锰的吸收也较对照有显著的增加。但对铁、硼的吸收却无一定的规律,三种作物均表现出较对照有所降低的趋势,是否稀土对作物吸收铁、硼有抑制作用尚需进一步深入研究。

STUDY ABOUT THE EFFECT OF AGRICULTURAL RARE EARTH ON THE NUTRIENT UPTEKE OF CROPS

In this article the effect of the agricultural rare earth on the nutrient uptake of crops is reported. After using 0. 03% and 0. 06% concentration of agricultural rare earth, N, P, K, and the microelements in rice, corn and wheat were analysed. The results of field and pot experiments showed as follows: Agricultural rare earth promoted the growth of roots and increased the root number by 3. 2%, the root length by 11. 47% and the root volume by 14. 05 — 18. 41 %. Because of the increase of the uptake area, the uptake of n and P, especially N, enhanced. The tendency is that the 0. 03% concentration for increasing the N uptake is better than that of 0. 06%. The effect of the uptake of K is not apparent as that of N and P. Low concentration(0. 03%) promotedcd the K uptake, but high concentration (0. 06%) inhibited it. From the study it is concluded that rare earth has good effect on the uptake of mn, Cu, Zn and Mo for wheat and has an apparent increase in the uptake of Mo and Mn for rice, but the uptake of Fe and B is rather changeable. The trend is that rare earth decreases the uptake of Fe and B in the three crops above. It is uncertain wheather or not rare earth inhibites the Fe aand B uptake, which needs some study.