A correlação linear entre a PG e a R foi praticamente nula, uma vez que, dependendo das profundidades estudadas do solo, apresentou coeficientes de correlação (r) menores do que 0,20. A análise geoestatística apresentou boa estrutura de dependência espacial, tanto para a PG quanto para a R, quando analisadas isoladamente. Entretanto, a análise espacial conjunta de tais atributos apresentou-se inconsistente. Assim, com o aumento da resistência mecânica à penetração, em determinada região do solo ocorreu ora aumento, ora diminuição do rendimento de grãos do feijoeiro.
SUMMARYOf all nutrients, N has the strongest effect on grass growth and an adequate N fertilization can reduce the time required for the formation of high-quality mats. This study aimed to evaluate the influence of N fertilization on Bermuda grass sod production and quality. The experiment was conducted in an area of commercial sod production, in Capela do Alto, state of São Paulo. Cynodon dactylon (Pers) L., known as Bermuda grass, was evaluated in a randomized complete block design with five treatments and four replications. Treatments consisted of five N rates: 0, 150, 300, 450 and 600 kg ha -1 . Increasing N applications to Bermuda grass increased the soil cover rate, reducing the time required for mat formation. The accumulation of rhizome + root + stolon dry matter was highest at a rate of 354 kg ha -1 N and the mat resistance to breakage at a rate of 365 kg ha -1 N. Nitrogen rates between 354 and 365 kg ha -1 increased mat resistance and consequently the suitability for postharvest handling, tending to improve the efficiency in the area.Index terms: Cynodon dactylon (Pers) L., fertilization rate, soil cover.(1) Recebido para publicação em janeiro de 2009 e aprovado em fevereiro de 2010.
SURFACE APPLICATION OF LIMESTONE AND DIFFERENT RESIDUES ON SOYBEAN GROWN IN NO-TILL SYSTEMThe practice of correcting soil acidity by surface application of pH-correcting materials on crop residues in the no-till system is restricted to limestone. No further studies are available on the use of steel slag, lime mud, and centrifuged sewage sludge. The objective of this study was to evaluate soil acidity and yield of soybean as a function of surface application of centrifuged sewage sludge, lime mud, steel slag, and dolomitic limestone. The study was conducted on a dystrophic Clayey Rhodic Hapludox soil, during the 2002-2005 cropping seasons, under no-till system. Treatments consisted on surface application of slag -E, lime mud -Lcal, centrifuged sewage sludge -LC, dolomitic limestone, and zero application of correcting materials, conducted in a random block design with four replicates. Surface application of steel slag, lime mud, and centrifuged sewage sludge allowed soil acidity correction, Ca 2+ displacement, increased base saturation, and Al 3+ reduction down to 40cm depth, whereas for limestone those effects occurred down to 20 cm. The interaction among those factors promoted a soybean yield increase for the LC, E, Lcal, and limestone treatments in the 2003/04 and 2004/05 seasons, as well as for the LC and E treatments in the 2002/03 season, under the no-till system.
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