Índices de nitrogênio e modelo para prognosticar a produção de tubérculos de batata
Palavras-chave:
Solanum tuberosum L, SPAD, Dualex, Asterix, ÁgataResumo
The use of indexes is a practical and important tool for nitrogen fertilization management on potato crop and can be used for the prognosis of tuber yield. Thus, this study aimed to determine the effect of splitting nitrogen fertilizer on nitrogen indexes, as well as to establish a model for the prognosis of tuber yield. The Agate and Asterix cultivars were used in two independent experiments. The treatments consisted of: T1 – control without N fertilization; T2 – 50% of N dose at planting and 50% of N dose at 22 days after plant emergence (DAE); and T3 – 100% of N dose at planting. Urea was used as source of N and the total dose applied was 220 kg ha-1 of N. The indexes evaluated were: chlorophyll (CHL), flavonol (FLV), nitrogen balance (NBI), evaluated with Dualex, and SPAD, determined in the fourth fully developed leaf at 10, 21, 34, 48, 62, and 76 DAE. Dose and N splitting interfered on the evaluated indexes, and the values of SPAD, CHL, and NBI decreased with increasing in plant age, while the FLV increased for both cultivars. The CHL index was the most suitable to indirectly estimate the petiole sap nitrate content, the N content in the dry matter, and the N accumulated in the fourth leaf. Both indexes, SPAD and CHL, can be used for the prognosis of the final potato tuber yield, and a model was established using these indexes.
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