前言在印度河——恒河冲积平原的碱土上,尽管适量地施用石膏及N、P、K肥料,但其产量仍然很低。在开垦的稻区最初几年中,发现缺锌是影响水稻产量的主要因素。碱土在世界分布很广,所以,这个问题可能在碱土地区普遍存在。此研究报告意在评价在碱土上施用锌肥及石膏对水稻的生长,产量及化学成分的影响效 Preface The production of gypsum and N, P and K fertilizers, though modestly applied, is still very low on the Indian and Ganges alluvial plain soils. In the early years of reclaimed rice areas, zinc deficiency was found to be a major factor affecting rice yield. Alkaline earth is widely distributed in the world, so this problem may be ubiquitous in the alkaline earth. This study is intended to evaluate the effect of applying zinc fertilizer and gypsum on alkaline soil on the growth, yield and chemical composition of rice