Effect of Organic Nutrition in the Nursery Growth and Nutrimental Content of Native Avocados of Ometepec, Guerrero, Mexico

Abstract

Abstract-

Effect of a nitrogenous nanocomposite on leaching and N content in lettuce in soil columns

“…The effect of SPAD in lettuce does not vary in relation to the doses of NO 3 − /NH 4 + , but it does vary when cultivating in different cycles: values of 39.38 in autumn and 29.58 in summer [41]. Drip irrigation makes the use of nanofertilizers in lettuce more efficient by increasing 25% of SPAD units (38 to 44) compared to the control applied to the soil (30)(31)(32)(33)(34)(35) [35]. In this case, neither with conventional fertilizer nor with NCN the doses of N showed a difference in the values at the end of the harvest, which suggests that the concentration of N applied reflected in the SPAD was similar.…”

“…The variables determined every 15 days in the leached solution were electrical conductivity (EC) (Meter, Walfront, China), NO 3 − K + Ca +2 ion content (Laqua Twin Ionometer, Horiba, Japan), as well as the evolution of the SPAD unit variables (Soil Plant Analysis Development, SPAD-502 Plus Chlorophyll Meter 2900P, Spectrum Technologies, Illinois, USA), and the normalized difference vegetation index (NDVI, Green Seeker Trimble handheld crop sensor, California, USA). At the end of the experiment, the fresh weight was evaluated on a digital scale (Ohaus PAJ4102N Gold series, USA), leaf area (CID 202 Portable Leaf Area Meter, USA) and total dry biomass in a forced-air drying oven (Omron, Japan) at 72 °C, until constant weight was obtained on a digital scale (Ohaus PAJ4102N Gold series, USA), and the analysis of ions (NO 3 − , K + and Ca +2 ) was carried out in the petiole cell extract [30] (Laqua Twin Ionometer, Horiba, Japan); the foliar N was determined by the Kjeldahl method [31],…”