Abstract
ABSTRACT The objective of this study was to evaluate the nutritional status of coriander cultivar Verdão under fertigation depths and pulse and continuous drip irrigation. The experiment was conducted in a protected environment at the Universidade Federal Rural de Pernambuco, Recife, PE, Brazil (8° 1’ 6.50” S, 34° 56’ 46” W and altitude of 6.5 m), in the randomized block design in 2 x 5 factorial scheme, with three repetitions. Treatments consisted of five irrigation depths (40, 60, 80, 100 and 120% of crop evapotranspiration - ETc) and two types of fertigation application (pulse and continuous). At 27 days after sowing, the aerial part of 48 plants per plot was collected for subsequent quantification of nitrogen, phosphorus, potassium, calcium, magnesium, sulfur, iron, manganese, copper and zinc concentrations. Pulse fertigation combined with ETc replacement depths below 100% promoted higher leaf concentrations of phosphorus, sulfur, iron and manganese. Continuous fertigation combined with 100% ETc depth induced sulfur deficiency in the crop and, combined with 40% ETc depth, promoted the highest calcium concentration. Regardless of the type of application, ETc replacement depths from 82.7 and 40% provide adequate leaf concentrations of nitrogen and magnesium, respectively. Regardless of the applied depth, pulse fertigation reduced the leaf concentrations of magnesium.
Highlights
The use of techniques and tools that promote the rationalization of inputs and increments in agricultural production is necessary for the development of an intensive and sustainable agriculture
The potassium (K) concentration obtained in the aerial part of coriander Verdão with the application of pulse fertigation showed increased by 17.6% compared to the continuous fertigation (Figure 1B). These results suggest that pulse fertigation may promote the maintenance of a more constant soil moisture throughout the day, so it may possibly have contributed to a greater stability of the soil solution and, provided greater absorption of the nutrient in comparison to its absorption under continuous fertigation
The present study found the benefit of pulse fertigation for K accumulation to the detriment of continuous fertigation, regardless of the applied depth
Summary
The use of techniques and tools that promote the rationalization of inputs and increments in agricultural production is necessary for the development of an intensive and sustainable agriculture. Among the new techniques developed to support irrigation management, there is pulse irrigation, a concept with recent studies that has the potential to maximize the use of water and fertilizers. This technique consists in applying the daily irrigation depth in small portions in a series of on-off irrigation cycles, and each event contains an irrigation phase and a resting phase (Almeida et al, 2015; García-Prats & Guillem-Picó, 2016). The determination of crop evapotranspiration (ETc) is extremely important for the correct planning, designing and management of any irrigation system. The use of pulse irrigation associated with the real water requirement of the crop can promote reduction in production costs and increments in yield
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