The soil fertility contribution of green manures to the productivity of Quinoa in marginal areas

Season
2021-2022

Main Objective

To determine the soil fertility contribution of three (3) green manures (cowpea, melilotus, and sesbania) to Quinoa yields.

Specific objectives are to evaluate the:

  • effect of clover, sesbania, and cowpea green manures to Quinoa yield.
  • effect of mineral fertilizer and green manure yields of Quinoa.
  • changes in carbon fluxes from green manure application

Experimental design

Experimental design: Strip plot with three replicates.

A. Vertical factor: Green manure species

  1. GM1: Melilotus
  2. GM2: Cowpea 
  3. GM3: Sesbania

B. Horizontal factor: mineral fertilizer

  1. FERT1: NPK  0:0:0
  2. FERT2: NPK 25:18:20
  3. FERT3: NPK 50:36:40

11

GM2 FERT2

12

GM3 FERT2

13

GM1 FERT2

14

GM2 FERT3

15

GM3 FERT3

16

GM1 FERT3

17

GM2 FERT1

18

GM3 FERT1

19

GM1 FERT1

21

GM1 FERT3

22

GM3 FERT3

23

GM1 FERT3

24

GM1 FERT1

25

GM3 FERT1

26

GM1 FERT1

27

GM1 FERT2

28

GM3 FERT2

29

GM1 FERT2

31

G12 FERT2

32

GM3 FERT2

33

GM2 FERT2

34

GM1 FERT1

35

GM3 FERT1

36

GM2 FERT1

37

GM1 FERT3

38

GM3 FERT3

39

GM2 FERT3

Test crop

1. Quinoa (Chenopodium quinoa Willd.)

Green manure crops

S/N

Crop common name

Scientific name

1

Cowpea

Vigna unguiculata (L.) Walp.

2

Melilotus

Melilotus officinalis. (L.) Pall.

3

Sesbania

Sesbania sesban (L.) Merr.