Variability in Cotton Fiber Yield, Fiber Quality, and Soil Properties in a Southeastern Coastal Plain

Abstract

To maximize profitability, cotton (Gossypium hirsutum L.) producand As. Elms et al. (1997) reported that yield in an ers must attempt to control the quality of the crop while maximizing irrigated cotton field in Texas displayed spatial correlayield. The objective of this research was to measure the intrinsic variability present in cotton fiber yield and quality. The 0.5-ha experi-tion. These authors also noted that production of fruitmental site was located in a producer's field (Norfolk-Coxville soil ing sites and fruit retention was spatially correlated. association) in Florence, SC, for 2 yr (1996 and 1997). Soil (0-20 cm) Micronaire exhibited a moderate degree of spatial variand fiber samples (1-m row) were collected from a regular grid (129.2 ability, and strength showed the lowest degree of variby 45.6 m, 7.6-m interval). Soil properties determined included soil ability.

Spatial variability of soil fertility and its relationship with seed physiological potential in a soybean production area

“…Such situation results in economical losses either due to the unnecessary application or in consequence of the imbalance among quantities of nutrients that will be available for plants Through the CV classification proposed by Wilding e Drees (1983), it was observed that pH, Ca, and V% had low variability, i.e., CV < 15%; Mn presented high variability (CV = 82.42%); and the remaining attributes were sorted as of moderate variability (15% < CV < 35%). In contradiction to what has been observed within this study, some authors have reported that the K content available for the plants presents high values for CV, while the values for the P available are normally high, remaining in the range of 40% to 80% (Johnson et al, 2002;Silva et al, 2007;Ward and Cox, 2000). Grain yield and physiological potential of seeds presented low CV, what is in accordance with what was observed by other authors, who obtained CV values varying from 8% to 29% (Pierce et al, 1995;Ping e Green, 2000).…”

Fiber quality of upland cotton under different irrigation depths

“…Dagdelen et al (2009) observed higher fiber resistance with water depth of 100% ETc, compared with other evaluated depths, and cite that fiber resistance decreases with the increase in water deficit. The same behavior was reported by Johnson et al (2002), who found positive correlation between fiber resistance and soil water availability. As to the excess of water, some studies show that fiber resistance decreases with the increase in rainfall/irrigation, which can be confirmed with the decrease in the values of fiber resistance for irrigation depths above 750 mm (105% ETc).…”

Spatial Variability of Soil Properties, Corn Quality and Yield in Two Illinois, USA Fields: Implications for Precision Corn Management

“…A possible reason for the lack of spatial structure in corn oil content is that corn oil is a highly heritable trait (Weber 1987) and genetic factors have a larger impact than environmental factors (Jellum and Marion 1966). A similar phenomenon has been observed with cotton fiber properties, which are also mainly controlled by genetics (Johnson et al 2002). Corn protein content of 33Y18, starch and moisture content and test weight of both hybrids all showed moderate spatial dependence, with the percentage of spatial structure (relative to the sill or total variance) varying from 34.4 (protein, 33Y18) to 65.3% (test weight, 33G26).…”

“…Johnson et al (2002) studied the spatial variability of cotton fiber quality parameters and found that many fiber length properties having strong genetic links did not exhibit any spatial correlation, while other fiber properties related to fiber maturity were spatially correlated. Kravchenko and Bullock (2002) found that soybean protein and oil concentrations exhibited well defined spatial structures, with ranges of spatial dependence exceeding 70 m in most of the study fields, although variogram parameters varied widely from field to field.…”