Fertilizer distribution mechanisms and side dress nitrogen fertilization in upland rice under no-tillage system

Scientia Agricola

Carlos Alexandre Costa Crusciol²  André De Moraes Costa¹  Émerson Borghi¹  Gustavo Spadotti Amaral Castro¹  Dirceu Maximino Fernandes¹ 

[1] ,UNESP FCA Depto. de Produção Vegetal/AgriculturaBotucatu SP ,Brasil

关键词: Oryza sativa L.;    furrow opener;    double disk;    N doses;    Oryza sativa L.;    haste sulcadora;    disco duplo;    doses de N;   

DOI  :  10.1590/S0103-90162010000500010

来源: SciELO

【 摘 要 】

Some crops have shown not to adapt to the no-tillage system (NTS) as a consequence of the compaction of the superficial soil layer. In a certain way, the mechanism used in seeders to open furrows for the deposition of fertilizers can have great importance in facilitating root penetration. This study was carried out to evaluate the influence of two fertilizer distribution mechanisms and N fertilization in upland rice (Oryza sativa) under NTS. The experiment was carried out in the growing seasons 2001/2002 and 2002/2003, in Botucatu, state of São Paulo, Brazil. A completely randomized block design was applied, with subdivided plots and four replications. Main plots consisted of two furrow opening mechanisms (furrow opener and double disk). Subplots consisted of four side dressing N levels (0, 40, 80 and 120 kg ha-1). The following parameters were evaluated: furrow and seed deposition depth, plant population, plant height, number of stems and panicles m-2, number of spikelets per panicle, spikelet fertility, weight of 1,000 grains, shoot dry matter, grain yield and N levels in the flag leaf. The success for upland rice establishment under the NTS in dry winter regions of Brazil is directly associated to the furrow opening mechanism of the seed-drill. The furrow opener mechanism resulted in deeper seed deposition, consequently decreasing seedling population, number of panicles per area and grain yield. Side dressing N fertilization in upland rice under NTS increases grain yield whenever the double disk mechanism is used to sow.

【 授权许可】

CC BY   
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