Nutrient reposition and Sequences in soybean based rotations (Marcos Juarez - Argentina)

Design period: Main period (2006—)

Design Type

random full blocks

Description

An experiment with different crop sequences was installed at the Marcos Juárez Experimental Station of the National Institute of Agricultural Technology (INTA). I include corn, soybean, wheat, and triticale crops as a cover crop) with and without nitrogen, phosphorus, and sulfur fertilization

Design description

The treatments that were evaluated were the following: 1) Soybeans without fertilization (S s / f); 2) Soybean with replacement fertilization of P and S (S c / f P and S); 3) Cover crop / Soybeans both without fertilization (CC / S s / f); 4) Cover crop / Soy with fertilization of P and S (CC / S c / f P and S); 5) Cover crop fertilized with N / Soybean with replacement fertilization of P and S. (CC c / fN -S c / f P and S) and 6) Cover crop fertilized with N / Soybean with replacement of P and S in sequence of 3 years with Corn and Wheat / Soy with NPS (SEC). Treatment 6 is described below, in which all crops are repeated every year: 6a-Corn with P and S fertilization (replacement) and 130 kg N; 6b-Wheat / Soybean with P and S fertilization (replacement) and 100 kg N and 6c-Cover crop fertilized with 80 kg of N / Soybean with replacement fertilization with P and S. The determination of the replacement dose was carried out in function of a defined objective yield for each crop, 12, 5, 3.2 and 4 t.ha-1 of corn, wheat, second-class soybeans and first-class soybeans, respectively.

Number of plots

24

Number of replicates

3

Number of harvests per year

2

Crops

Crop	Years grown
soybeans
maize
wheat
cover crop

Factors

Factor name

Factor levels

crop rotation

cropping system

fertilizer exposure