Size arrangements, percentage distribution of fresh harvested mature green tomatoes and vitamin A content were evaluated for plastic mulched-staked (PS), plastic mulched-nonstaked (PNS), non-mulched-staked (NPS), and nonmulched- nonstaked (NPNS) tomatoes under drip irrigation in wet, moist and dry treatments, respectively. Percentage distribution of number of fruits was highest in USDA fruit size class No. 6 for all treatments and subtreatments. For all treatments, the average fruit weight was highest during the second picking in the NPNS, NPS and PNS plots compared to the first picking in the PS plots. The dry treatment gave highest percentage of US grade I tomatoes in the NPNS and PS plots compared to that of the moist treatment in the NPS and the wet treatment in the PNS plots, respectively. The vitamin A content was highest in NPNS plots for wet and moist treatments, and in PS plots for dry treatment. The PS plots in the wet and moist treatments, and NPS plots in the dry treatment gave the lowest values of vitamin A content.
Five commercial greenhouses in the central mountainous zone of Puerto Rico were studied in order to identify changes in soil factors that affect P retention. Soils were collected both within and outside drainages at a 0- to 15-cm depth. Soil physicochemical properties varied in samples taken both within and outside drainages. The high Fe and Al content in the soils of this study suggested a high phosphorus retention capacity. Laboratory estimates of P retention parameters indicated differences in P sorption capacity among soils. Phosphorus retention parameters were highly correlated with citrate dithionite extractable Fe. The equilibrium P concentration was also correlated with citrate dithionate Al in soils outside drainages. This finding was due to the higher soil organic matter counterbalancing the soil P retention capability of Al, all of which indicates the importance of clearing all drainages of organic residues in order to avoid excessive movement of P outside the greenhouse premises.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.