Abstract
Dry matter production and productivity of stem currently are being widely studied in sugarcane, reinforcing the study in question, which aims to assess the accumulation of dry matter of the aerial segment and the productivity of stems of sugarcane crops within the first cycle, at different levels of water replacement (WR) with and without nitrogen fertilization, through a subsurface drip irrigation system. The assay was conducted in the experimental area of the Federal Institut Goiano, Campus Rio Verde, GO, Brazil, in a dystroferric Rhodic Hapludox soil, cerrado phase (savannah), and comprised experimental splits of three furrows with an 8-meter long double row. Experimental design consisted of randomized blocks in a 5 × 2 factorial array, with four replications. Evaluated factors comprised five levels of WR (100%, 75%, 50%, 25% and 0% of field capacity), with and without the application of nitrogen (0 and 100 kg·ha-1 urea). Harvest occurred in May 2013 and stem productivity (SP), productivity of pointers (PP), productivity of straw (PS), harvest index (HI), dry matter of stem (DMS), dry matter of pointers (DMP), the relationship between dry matter of pointer and dry matter of stem (DMP/DMS) and total dry matter of the aerial segment (TDM) were determined. The variables SP, PP, DMS and DMP had a linear growth in proportion to WR increase, whereas HI and DMP/DMS adjusted to a quadratic model. Nitrogen fertilization affected positively the variables SP, HI, DMS and DMP/DMS and occurred interaction to TDM; also increasing the productivity stem and the harvest index.
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Claims 6
Claim · model-written summary
Stem productivity, productivity of pointers and dry matter of stem increased linearly with water replacement level in sugarcane.
Verbatim
e0“Dry matter production and productivity of stem currently are being widely studied in sugarcane”
e2“Evaluated factors comprised five levels of WR (100%, 75%, 50%, 25% and 0% of field capacity), with and without the application of nitrogen (0 and 100 kg·ha-1 urea)”
e3“The variables SP, PP, DMS and DMP had a linear growth in proportion to WR increase, whereas HI and DMP/DMS adjusted to a quadratic model”
Claim · model-written summary
Dry matter of pointers increased linearly with water replacement level in sugarcane.
Verbatim
e0“Dry matter production and productivity of stem currently are being widely studied in sugarcane”
e2“Evaluated factors comprised five levels of WR (100%, 75%, 50%, 25% and 0% of field capacity), with and without the application of nitrogen (0 and 100 kg·ha-1 urea)”
e3“The variables SP, PP, DMS and DMP had a linear growth in proportion to WR increase, whereas HI and DMP/DMS adjusted to a quadratic model”
Claim · model-written summary
Harvest index and the ratio of dry matter of pointers to dry matter of stem responded quadratically to water replacement level.
Not reportedDirection
Verbatim
e0“Dry matter production and productivity of stem currently are being widely studied in sugarcane”
e3“The variables SP, PP, DMS and DMP had a linear growth in proportion to WR increase, whereas HI and DMP/DMS adjusted to a quadratic model”
Claim · model-written summary
Nitrogen fertilization positively affected stem productivity, harvest index and dry matter of stem in sugarcane.
Verbatim
e0“Dry matter production and productivity of stem currently are being widely studied in sugarcane”
e2“Evaluated factors comprised five levels of WR (100%, 75%, 50%, 25% and 0% of field capacity), with and without the application of nitrogen (0 and 100 kg·ha-1 urea)”
e4“Nitrogen fertilization affected positively the variables SP, HI, DMS and DMP/DMS and occurred interaction to TDM”
Claim · model-written summary
Nitrogen fertilization positively affected the ratio of dry matter of pointers to dry matter of stem in sugarcane.
Verbatim
e0“Dry matter production and productivity of stem currently are being widely studied in sugarcane”
e2“Evaluated factors comprised five levels of WR (100%, 75%, 50%, 25% and 0% of field capacity), with and without the application of nitrogen (0 and 100 kg·ha-1 urea)”
e4“Nitrogen fertilization affected positively the variables SP, HI, DMS and DMP/DMS and occurred interaction to TDM”
Claim · model-written summary
Nitrogen fertilization showed an interaction effect on total dry matter of the aerial segment in sugarcane.
Not reportedDirection
Verbatim
e0“Dry matter production and productivity of stem currently are being widely studied in sugarcane”
e4“Nitrogen fertilization affected positively the variables SP, HI, DMS and DMP/DMS and occurred interaction to TDM”
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