Nitrate and potassium movement in a sandy loam soil cultivated with fertigated grapevine (Vitis vinifera /L.) in the Brazilian semiarid

Abstract

Fertigation can increase the efficiency of fertilizer application and facilitate the nutritional management of a crop. Thus, nitrate and potassium movements in a sandy loam soil were evaluated as function of fertilizer doses during three growing seasons of the grapevine cv. Syrah grafted on Paulsen 1103 rootstock (June to October 2013, February to June 2014, and August to November 2014) in Petrolina, state of Pernambuco, Brazil. Five doses of N (0, 15, 30, 60 and 120 kg ha-1) and five doses of K2O (0, 15, 30, 60 and 120 kg ha-1) were combined in a fractional 52 factorial design, totaling 13 combinations, in a randomized blocks experiment with four replications. The concentrations of nitrate and potassium in the soil solution were determined. Samples were collected by porous cup extractors installed at 0.4 and 0.6 m depths. The movement of these ions was obtained by the product between their concentration in the soil solution and the soil water flux density. The increase in nitrogen fertilization promoted a greater movement of NO3- (62.2 kg ha-1) in the soil. The movement of K+ was also observed in two growing seasons .

Analysis of Soil Fertility in Oil Palm Plantation (Elaeis guineensis Jacq) Smallholder Farmers in East Luwuk District, Banggai Regency

“…Furthermore, the nature of K ions in the soil solution also provokes K leaching. Compared to other cations, K ion is very mobile; hence, they are easily exchanged from the soil exchange complex and washed out from the soil system (Barber 1985: Al Mu'min et al, 2016Afandi et al, 2017;da Silva et al, 2018).…”

Identification and Assessment of Soil Physical and Chemical Properties for Vanili Plants in North Tinangkung District, Banggai Islands Regency

“…Kandungan K 2 O tanah (Tabel 7) menunjukkan bahwa K total dalam tanah pada lokasi penelitian tergolong rendah. Hal ini dapat terjadi kemungkinan akibat kombinasi beberapa faktor seperti rendahnya kandungan K pada bahan induk tanah dan ion K dalam larutan tanah yang bersifat mobile sehingga mudah tercuci keluar dari sistem tanah (Barber 1985;da Silva et al, 2017). Kandungan total K yang rendah juga mencerminkan kondisi ketersediaan K yang rendah dalam larutan tanah.…”

Assessing soil fertility status and land suitability for patchouli plants (Pogostemon cablin Benth.) in Lamala District, Banggai Regency

“…The K content in the soil showed a similar value. This condition occurs due to a combination of factors such as the low K content in the soil due to high K uptake by plants and soil erosion (Al Mu'min et al 2016), as well as the nature of K ions in the soil solution, which is mobile so that it is easily leached out from the soil system (Barber, 1985;da Silva et al 2017). The low capacity of soil minerals to replace lost K, or in other words, K sources in basaltic or ultramafic soil parent materials that contain low K on average.…”