Localización de zonas aptas para la agricultura protegida en Baja California Sur, México

This study was conductedto define potential sites to establish protected agriculture inBaja California Sur, Mexico, taking into account weather andsoil variables. A soil sampling was conducted in 51 sites fromOctober to November 2010; besides, the available amountof N, P and K, pH and Electrical Conductivity (EC) wereanalyzed. Results showed a low concentration of N, highcontent of P, and a variant concentration for K. Moreover,observed pH was alkaline and EC varied from moderate tolow level. Based on the results, it can be stated that BajaCalifornia Sur has different weather and soils in each of itscounties. As a consequence, there are considerable variationsin protected agriculture development. The higher surfacein Baja California Sur, suitable for protected agriculture,measured in May 2010, was quantified in 6,811,778 ha. Mostof the year is optimal to cultivate under protected agricultureapproach, without the need for additional mechanisms forweather control. However, during the summer conditionsare suboptimal and it is necessary to introduce means todecrease high temperatures.El objetivo delpresente trabajo fue localizar zonas aptas para el desarrollode la agricultura protegida en Baja California Sur. Seevaluaron variables meteorológicas y edáficas. Se realizó unmuestreo de suelos en 51 sitios de octubre a noviembre de2010, además se analizó la disponibilidad de N, P, K, pH yC.E. Hubo baja concentración de N, alta de P, mientras queel de K varió en cada suelo. El pH de las muestras de suelosfue alcalino y la C.E. de moderada a baja. Baja CaliforniaSur presentó diferentes características de clima y suelo,incluso a nivel municipal. En consecuencia, se presentaronvariaciones extremas de la temperatura y fotoperiodo para eldesarrollo de la agricultura protegida; en mayo se encontróla mayor superficie con condiciones aptas, con 6 811 778ha. La mayor parte del año presentan condiciones óptimaspara cultivar bajo invernadero, sin la necesidad de instalarmecanismos adicionales para controlar la temperatura. Sinembargo, durante el verano las condiciones son subóptimasy es necesario disminuir las altas temperaturas

Localización de zonas aptas para la agricultura protegida en Baja California Sur, México.

This study was conductedto define potential sites to establish protected agriculture inBaja California Sur, Mexico, taking into account weather andsoil variables. A soil sampling was conducted in 51 sites fromOctober to November 2010; besides, the available amountof N, P and K, pH and Electrical Conductivity (EC) wereanalyzed. Results showed a low concentration of N, highcontent of P, and a variant concentration for K. Moreover,observed pH was alkaline and EC varied from moderate tolow level. Based on the results, it can be stated that BajaCalifornia Sur has different weather and soils in each of itscounties. As a consequence, there are considerable variationsin protected agriculture development. The higher surfacein Baja California Sur, suitable for protected agriculture,measured in May 2010, was quantified in 6,811,778 ha. Mostof the year is optimal to cultivate under protected agricultureapproach, without the need for additional mechanisms forweather control. However, during the summer conditionsare suboptimal and it is necessary to introduce means todecrease high temperatures.El objetivo delpresente trabajo fue localizar zonas aptas para el desarrollode la agricultura protegida en Baja California Sur. Seevaluaron variables meteorológicas y edáficas. Se realizó unmuestreo de suelos en 51 sitios de octubre a noviembre de2010, además se analizó la disponibilidad de N, P, K, pH yC.E. Hubo baja concentración de N, alta de P, mientras queel de K varió en cada suelo. El pH de las muestras de suelosfue alcalino y la C.E. de moderada a baja. Baja CaliforniaSur presentó diferentes características de clima y suelo,incluso a nivel municipal. En consecuencia, se presentaronvariaciones extremas de la temperatura y fotoperiodo para eldesarrollo de la agricultura protegida; en mayo se encontróla mayor superficie con condiciones aptas, con 6 811 778ha. La mayor parte del año presentan condiciones óptimaspara cultivar bajo invernadero, sin la necesidad de instalarmecanismos adicionales para controlar la temperatura. Sinembargo, durante el verano las condiciones son subóptimasy es necesario disminuir las altas temperaturas

Germination of <i>Salicornia bigelovii</i> (Torr.) under Shrimp Culture Effluents and the Application of Vermicompost Leachate for Mitigating Salt Stress

Attenuators of salt-stress favor the use of effluents, being a low-cost organic product. The present study aimed to evaluate the effect of vermicompost leachate (VL) added to shrimp-culture effluent on seeds and seedlings of Salicornia bigelovii (Torr.) under salt-stress, evaluating germination, water relations variables, and biomass. Seeds were irrigated with distilled water (DW) (CE: 0.0027 dS m−1), freshwater (FW) (CE: 1.36 dS m−1), seawater (SW) (CE: 55.83 dS m−1), shrimp residual water (SRW) (CE: 59.85 dS m−1), and with the same water sources but adding VL in 1:20 v/v. The means for the index of germination rate (IGR), germination energy (GE), and germination time (MGT) were higher with DW, DWVL, FW, and FWVL, decreasing with the others (p ≤ 0.05). In seedlings, the lowest water potential (Ψw) and osmotic potential (Ψs) were observed with SW, SWVL, SRW, and SRWVL (p ≤ 0.05), evidencing higher stress but the highest relative water content (RWC). The fresh and dry biomass increased and showed significant differences with SRW, and adding VL (DWVL, FWVL, SWVL, and SRWVL) acted as an effective attenuator of salt-stress. The response of water relations variables suggested an osmotic adjustment for mitigating the salt-stress in seedlings, lowering the Ψw and Ψs but increasing the RWC