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为明确红壤区不同旱土作物、土壤条件对各种作物增产效益 ,分别在第四纪红土红壤、砂岩红壤、板页岩红壤种植花生、高粱、黄豆、红薯四种作物。试验结果表明 :(1)施用镁肥能促进旱土作物的生长发育 ,黄豆、花生生育期提早 2～3d成熟 ;有利于旱土作物高产。黄豆施用镁肥比ck增产2 2 7.7kg/hm2 ,增幅 2 5 .5 % ;结实率提高 2 .7% ;百粒重增加1.5 g。花生增产 5 0 0kg/hm2 ,增幅 2 5 .0 % ;饱果数增加 4.5万个 /hm2 ;百果重增加 15 .1g ;单株分枝数多 0 .9个。高粱施用镁肥比ck增产 194.5kg/hm2 ,增幅 11.6 %。红薯施用镁肥较ck增产 16 6 6 .6kg/hm2 ,增幅 6 .8%。 (2 )三种土壤类型施用效果 ,以新开垦的第四纪红土红壤增产效果最为明显。 (3)供试的四种作物 ,以黄豆施用镁肥增产效果最为著显。其次是花生 ,红著增产效果最差
In order to clarify the benefits of different dry land crops and soil conditions on the yield increase of various crops in red earth area, four crops of peanut, sorghum, soybean and sweet potato were planted in the lateritic red soil, red sandstone and shale red soil respectively. The results showed that: (1) The application of magnesium fertilizer can promote the growth and development of dry land crops, and the growth period of soybean and peanut matured by 2 ~ 3d earlier; it is benefit to the high yield of dry land crops. Soybean application of magnesium fertilizer than ck yield 2 2 7.7kg / hm2, an increase of 25.5%; seed setting rate increased by 2.7%; 100 grain weight increased by 1.5 g. Peanut yield 500kg / hm2, an increase of 25.0%; full fruit number increased 4.5 million / hm2; fruit weight increased 15.1g; number of branches more than 0.9. Magnesium fertilizer application sorghum than CK increased 194.5kg / hm2, an increase of 11.6%. The application of sweet potatoes fertilizer than ck 16 6 6 .6 kg / hm2, an increase of 6.8%. (2) The application effects of the three soil types, the yield of the later reclaimed Quaternary red soil is the most obvious. (3) For the four crops tested, the effect of applying magnesium fertilizer to soybeans was the most obvious. Followed by peanuts, red with the worst yield