福建省几种红壤镁肥肥效的研究

通过大田和培养试验,研究了福建省几种红壤施用镁肥的增产效果。认为供试的酸性红壤交换性镁含量在4.7mg/100g 土以下时施用镁肥,对促进大豆、油菜根系和地上部生长,加强氮、磷、镁素的吸收,均有良好的作用;对大豆、油菜和甘薯有较好的增产效果。镁肥配合当地农家肥施用,对大豆仍有一定增产作用。在当前闽南生产水平下,大豆和甘薯每公顷施用镁15～19公斤较为适宜。由于遗传基因的不同,作物对营养液中镁素浓度的要求以及对低浓度镁的敏感性也不同。其要求高低和敏感性大小顺序为:油菜>大麦、豌豆>小麦。

STUDIES OF THE MAGNESIUM EFFECTS IN VARIOUS TYPES OF RED SOILS IN FUJIAN PROVINCE

Field experiments,pot tests and solution culture with magnesium effect to soybean,rape,sweet potato and the main winter crops were carried out in 1982-1984,at FAC,Sanmin,and Red Soil Research Institute, Jinjiang,respectively.Our data and results showed that in ed soils, with exchangeable Mg less than 4.7mg/100g,responded very well with magnesium fertilizer in promoting the root development and top growth of soybean and rape,as well as the yield components so that the yields in- creased significantly.In addition to magnesium,liming also showed effec- tively.Under the local practice of farm manure,magnesium fertilizer still revealed respond to soybean.It is therefore recommended that 15.0-19.0 kg of MgSO_4 per hectare are adequate for soybean or sweet potato under the present yield levels of southern Fujian Province.Solution culture proved that due to the difference of genetic make up,the main winter crops of this province required different Mg concentration according to the following de- creasing order:rape>barly and pea>wheat.