Effect of the previous crop and of soil compaction on macronutrient uptakeby soybean

The effect of seven species cropped just before soybean, as well as the eff ect of soil compaction on macronutrient uptake by soybean were evaluated. T he experiment was conducted in pots containing a Red Latosol (Acrortox, loa my sand), and the pots had a layer 3.5 cm thick and 15 cm deep compacted to 1. 12, 1,36 and 1.60 Mg m(-3). Before soybean, the pots were cropped to bl ack oat, pigeon pea, pearl millet, black mucuna, soybean, grain sorghum and lupin, plus a treatment without plants. These species were grown for 37 to 39 days, when they were cut at soil level, pricked into particles of appro ximately 3 cm length, and left on the soil surface for 40 days, After this, soybean was planted in the pots and grown for 28 days after plant emergenc e. The shoot dry matter weight, concentration and accumulation were evaluat ed. The subsoil compaction decreased the nutrition of soybean. The nutritio n of soybean is benefited when in sequence to soil cover crops. The soil wi thout plants is not recommended as well as method to reduce the effects of the soil compaction.