Nitrogen economy of a sandy soil under groundnut-maize cropping sequence at Kuala Brang, Trengganu [Peninsular Malaysia, Arachis hypogaea, Zea mays]
1982
Othman Yaacob (Universiti Pertanian Malaysia, Serdang, Selangor. Faculty of Agriculture)
Groundnut crops have been cultivated on sandy alluvial soil (900 ha) in Kuala Brang, Malaysia since 1971. They are grown in rotation with rice or maize under village level technology, using a minimum amount of fertilizer nitrogen. To monitor changes in total soil N and the amount of N removed by crop and weeds, the Soil Science Department, Universiti Pertanian Malaysia in collaboration with the local Farmers Organization Authority, set up a small pilot research project. The amount of N removed by groundnuts and weeds and the level of soil N at the end of one cropping phase were estimated from cropped and uncropped control plots. Any average of 130, 60 and 46 kg N.ha-1 and crop-1 was removed from plots sown to groundnuts as stubbles, unshelled nuts and weeds respectively, while 12 kg N.ha-1 crop-1 was obtained from weeds in control plots. The total soil N-1(0-15 cm) was estimated to be 1080 kg N.ha-1 for groundnut plots and 1480 kg N.ha-1 for control plot. The significance of these data is discussed in relation to the overall N economy of the system operating at the village level technology in Malaysia
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