DRIS Norms for grafted and non-grafted red bell pepper in semi arid climate conditions in a greenhouse

Abstract

The objective of this study was to compute and compare DRIS norms for grafted and non-grafted red bell pepper crops grown in semi arid climate conditions. DRIS norms were computed with 84 samples of first young mature leaves collected during developed stage. The experiment had a completely randomized block design, and the values obtained for each plant and each variable were considered as independent replicates. Thirty-two DRIS norms nutrient ratios and coefficients of variation (CV) were computed from N, P, K, Ca, Mg, Fe, Cu, Zn and Mn analytical results. The ratios P/N and K/N in grafted and non-grafted pepper plants, showed low CV and therefore may play a fundamental role in crop production according with the DRIS norms calculated, since as light modification in the nutrient concentration led to a significant change in the nutritional balance. In conclusion, DRIS norms are sensitive for grafted and non-grafted plants. This work may signify an improvement in the nutritional diagnosis of grafted and non-grafted red bell pepper in semi arid climate conditions under a shaded greenhouse.

DRIS Norms and Sufficiency Ranges for Pepper Grown under Greenhouses Conditions in the Southeast of Spain

“…Nevertheless, in fruit development (FD), there were two ratios with lower CV: N/P (30.34%) and Ca/N (24.85%). Similar results were also noted by Abd El-Rheem et al [15] (P/N; 23.88%) and Sánchez et al [11] (Ca/N; 25.62%) in pepper crop. The importance of N/P in the FD can be due to the high mobility translocation of both elements from leaf to the most nutrient demanding organs (fruits) [32,33].…”

“…In this experiment, the phenological stages of FL showed ratios with lower CV such as N/P and N/K (26.44 and 19.22%, respectively). Analogously, similar CV values for these ratios were reported by Abd El-Rheem et al [15] (24.52 and 18.62%, respectively) and Sánchez et al [11] (20.04 and 9.98%, respectively) in pepper crop. The importance of the N/P ratio may be because both elements have synergistic effects resulting in growth stimulation and enhanced uptake of both elements [20] and the importance of N/K ratio can be due to the increase of these nutrients requirements in fruiting [30] and consequently, any deficit of an element can have a negative impact on the growth and yield of pepper [31].…”

“…One solution to solve this problem is the determination of DRIS (Diagnosis and Recommendation Integrated System) norms. Nevertheless, the DRIS norms can be also sensitive to different factors such as tissues age, phenological stage, climate, soil conditions, and the cultivar compared to the sufficiency range approach [11]. This low sensitivity can be ascribed to the determination of nutrient ratios as reported by Beaufils [12].…”

“…The method to select the form of the ratio for a pair of nutrients to be used in DRIS calculation was described by Walworth and Sumner [13] and Nick [14]. DRIS evaluation has already been used and determined on pepper by El-Rheem et al [15] and Sánchez et al [11], but the information about the DRIS norms divided by phenological stages is rather scarce. Therefore, considering the importance of the pepper crop in the southeast of Spain, the aim of this study was to constitute DRIS norms and sufficiency ranges for pepper grown in greenhouses and the verification of the variation in DRIS norms and sufficiency ranges during the phenological stages.…”

Creating Foliar Diagnosis Rules for Almond Trees (Prunus dulcis, Mill.) Grown Under Different Watering Regimes: Irrigation vs Rainfed

“…Presently, it is observed that the DRIS standards for the same variety depend on many factors, such as environmental conditions, rootstock utilized, etc. [11,12]. The standards for each variety and climate scenario will be useful in the future for developing the algorithms with which to interpret the foliar analysis.…”